In Latin records, numbers are written in a variety of ways. Scribes may write out the date numerically or express it in Arabic numbers or Roman numerals. Because Arabic numbers are still used today, they can be fairly easy to read. Similarly shaped numbers such as 1 and 7 or 5 and 9 may still be confused, but a close reading of the document will usually result in the correct understanding of which number has been written.
Many times, scribes will choose to write out a number in Latin. When expressing a quantity, scribes would write out the cardinal form of a number. However, when numbers functioned as descriptive ordinals in a sentence, they were declined differently depending on how they were used in the sentence. When expressing a date, numbers are most commonly expressed as ordinal numbers in the ablative case.
The following table shows the Cardinal, Nominative Ordinal, and Ablative Ordinal spellings of numbers in Latin.
Cardinal
Ordinal
Arabic
Latin
Arabic
Latin Nominative Case
Latin Ablative Case
1
unus, una, unum
1st
primus, prima, primum
primo
2
duo, duae, duo
2nd
secundus
secundo
3
tres, tria
3rd
tertius
tertio
4
quattuor
4th
quartus
quarto
5
quinque
5th
quintus
quinto
6
sex
6th
sextus
sexto
7
septem
7th
septimus
septimo
8
octo
8th
octavus
octavo
9
novem
9th
nonus
nono
10
decem
10th
decimus
deimo
11
undecim
11th
undecimus
undecimo
12
duodecim
12th
duodecimus
duodecimo
13
tredecim
13th
tertius decimus
tertio decimo
14
quattuordecim
14th
quartus deimus
quarto decimo
15
quindecim
15th
quintus decimus
quinto decimo
16
sedecim
16th
sextus decimus
sexto decimo
17
septendecim
17th
septimus decimus
septimo decimo
18
duodeviginti
18th
duodevicesimus
duodevicesimo
19
undeviginti
19th
undevicesimus
undevicesimo
20
viginti
20th
vicesimus
vicesimo
21
viginti unus unus et viginti
21st
vicesimus primus unus et vicesimus
vicesimo primo
22
viginti duo duo et viginti
22nd
vicesimus secundus secundus/alter et vicesimus
vicesimo secundo
23
viginti tres & etc.
23rd
vicesimus tertius &etc.
vicesimo tertio
24
viginti quattour
24th
vicesimus quartus
vicesimo quarto
25
viginti quinque
25th
vicesimus quintus
vicesimo quinto
& etc.
& etc.
& etc.
& etc.
& etc.
30
triginta
30th
tricesimus
tricestimo
40
quadraginta
40th
quadragesimus
quadragesimo
50
quinquaginta
50th
quinquagesimus
quinquagesimo
60
sexaginta
60th
sexagesimus
sexagesimo
70
septuaginta
70th
septuagesimus
septuagesimo
80
octoginta
80th
octogesimus
octogesimo
90
nonaginta
90th
nonagesimus
nonagesimo
100
centum
100th
centesimus
centesimo
101
centum et unus
101st
centestimus primus
centesimo primo
151
centum quinquaginta unus
151st
centesimus quinquagesimus primus
centesimo quinquagesimo primo
200
ducenti, ducentae, ducenta
200th
ducentesimus
ducentesimo
300
trecenti
300th
trecentesimus
trecentesimo
400
quadringenti
400th
quadringentesimus
quadringentesimo
500
quingenti
500th
quingentesimus
quingentesimo
600
sesenti
600th
sescentesimus
sescentesimo
700
septingenti
700th
septingentesimus
septingentesimo
800
octingenti
800th
octingentesimus
octingentesimo
900
nongenti
900th
nongentesimus
nongentesimo
1000
mille
1000th
millesimus
millesimo
1551
mille quingenti quinquaginta unus
1551st
millesimus quingentesimus quinquagesimus primo
millesimo quingentesimo quinquagesimo primo
Roman numerals were also written similarly to how they appear today. This numeric system has been in use for much of Western Civilization; even with the introduction of Arabic numerals, there was a lot of resistance, especially from merchants, as it was viewed that roman numerals were harder to manipulate or fudge. To this day, this system is still used as a symbol of classical wisdom and tradition.
Roman numerals assign values to different letters and then use a combination of letters to create different numerical values. During the Middle Ages, there were new symbols introduced at different times and places; however, the basic, classic values are as follows:
I
V
X
L
C
D
M
1
5
10
50
100
500
1,000
Other values can be made depending on their relation to each other. For example, to make the number 4, one would take the letter 'V' for 5 and put a 'I' before it, making 'IV.' This can be read as "one less than five" or simply "four." Similarly, to make larger numbers such as 7, one adds two 'I's' after the letter 'V' to make 'VII.' This can be read as "two more than five" or just "seven."
Therefore, larger numbers can become quite long. For example:
MCMXCVI > M - CM - XC - VI > 1,000 + 900 + 90 + 6 = 1996 MDCCLXXVI > M - DCC - LXX - VI > 1,000 + 700 + 70 + 6 = 1776 MMXXII > MM - XX - II > 2,000 + 20 + 2 = 2022
Small variations do occur, especially when scribes used lower case letters to represent the numerals, as shown in the chart of roman numerals below.
Some of the older documents you look at may use the following symbol:
This "U" like character signifies the space between the thousands place and the hundreds place.
For example:
or "1 U DXCI" would be 1591. Before the "U," the scribe may place a "1" instead of an "M" (such as with our 1591 example.)
Scribes frequently abbreviated common numeric expressions, such as writing milloor mmoinstead of millesimo, when recording a date. When faced with what appears to be an abbreviated date, it can be helpful to look at previous entries to see if the scribe wrote out the full word at the beginning of a page and to check a number list for the full spelling of the name. It may also be useful to consult a dictionary of Latin abbreviations. The most comprehensive is Lexicon Abbreviaturarum by Adriano Cappelli, available online for free at archive.org.
Calendars
When recording dates in Latin documents, it is important to be aware of the customs of the area where the record is being kept. Latin was a universal language. Calendars varied between countries, with scribes following the Julian, Georgian, or Regnal calendars, depending on the time period and location. Even when the date follows the typical form of day, month, or year, it may be difficult to interpret which month is listed. Scribes frequently abbreviated months or substituted the stem of the noun for a Roman numeral or Arabic number equivalent.
From 45 BC until the late 1500s, most of the Western world followed the Julian calendar. The Julian calendar had a year of 365 days, divided into twelve months. However, the treatment of leap years caused the calendar to shift forward about three days every four centuries, resulting in its replacement by the Georgian calendar in 1582. During the transition, many scribes recorded the date in both the Julian and Georgian form: the exact year and (often) month, but with a thirteen-day discrepancy. Other scribes quickly adopted the new system, causing a seemingly unexpected thirteen-day gap in their records. Prior to the adoption of the Gregorian calendar, the first month of the year was March 25. Accordingly, September was the seventh month and appears as Septembris, 7bris, or vijbris. The last three months of the year were Octobris, 8bris, or viijbris; Novembris, 9bris, ixbris or viiijbris; and Decembris, 10bris, or Xbris. (Note that i and j were interchangeable until the late 1700s.)
At other times, scribes would judge dates based on the regnal years of their nation's monarch or base it on major holidays of the Catholic Church. Many online directories list the regnal years of the monarchs of various countries, as well as the modern dates of major holidays throughout time. Such resources can be very helpful in interpreting the written date.
Additionally, Latin months declined like all other nouns, resulting in various noun endings. In documents, months usually appeared in the genitive form, preceded by "mensis," or "of the month...." The nominative and genitive forms are both shown in the following table.
English
Latin
Nominative Case
Genitive Case - Written
Genitive Case - Roman Numeral
Genitive Case - Arabic Number
January
Januarius
Januarii / Januarij
xirii
11ij
February
Februarius
Februarii / Februarij
xijrii
12ij
March
Martius
Martii / Martij
N/A
N/A
April
Aprilis
Aprilis
N/A
N/A
May
Maius
Maii, Maij
N/A
N/A
June
Junius
Junii, Junij
N/A
N/A
July
Julius
Julii, Julij
N/A
N/A
August
Augustus
Augusti, Augustij
vjbris
6bris
September
September
Septembris
vijbris
7bris
October
October
Octobris
viijbris
8bris
November
November
Novembris
viiijbris
9bris
December
December
Decembris
xbris
10bris
Days of the week are often declined in Latin. Like months, they usually appear in the genitive case, following the word "dies" (translated: "the day of ___"). The following table includes the nominative, genitive, and ablative forms of each day of the week.
English
Latin
Nominative Case
Genitive Case
Ablative Case
Sunday (day of the Lord [Christian calendar], day of the sun, first day of the week)
(dies) Dominicus/Dominica (dies) Solis feria prima
(dies) Dominici/Dominicae (dies) Solis feriae primae
(die) Dominico/Dominica (die) Solis feria prima
Monday (day of the moon, second day of the week)
dies Lunae feria secunda
dies Lunae feriae secundae
die Lunae feria secunda
Tuesday (day of Mars, third day of the week)
dies Martis feria tertia
dies Martis feriae tertiae
die Martis feria tertia
Wednesday (day of Mercury, fourth day of the week)
dies Mercurii feria quarta
dies Mercurii feriae quartae
die Mercurii feria quarta
Thursday (day of Jove/Jupiter, fifth day of the week)
dies Jovis feria quinta
dies Jovis feriae quintae
die Jovis feria quinta
Friday (day of Venus, sixth day of the week)
dies Veneris feria sexta
dies Veneris feriae sextae
die Veneris feria sexta
Saturday (day of Saturn, seventh day of the week, the Sabbath [Jewish Calendar])
dies Saturni feria septima dies sabbatinus/sabbatina sabbatum
dies Saturni feriae septimae dies sabbatini/sabbatinae sabbati
die Saturni feria septima die sabbatino/sabbatina sabbato
Table of Roman Numerals: D. Jesús Muñoz y Rivero, Tabla de numerales, 1917, in D. Jesús Muñoz y Rivero, Manual de paleografía diplomatica española de los siglos xii al xvii: método teórico-práctico para aprender á leer los documentos españoles de los siglos xii al xvii, (Madrid: 1917); Digital image, Internet Archive (archive.org: accessed 3 April 2024), p103. This image is in the public domain.