The practice of diagramming sentences first began in America in the middle of the nineteenth century. Set against the full history of grammatical study, diagramming is a relative newcomer. Language has been studied systematically since at least the second century bce in the western world, and even earlier in India. Yet sentence diagrams—visual depictions of the relationships among words—were developed only after over 2000 years of study. From our vantage, the desire to visualize sentence structure may seem like an intuitively obvious move.

St. Paul's Cathedral Brew-House

Grain Received, A.D. 1286:
From Manors

Quarters Bushels % of total
Wheat 832.5 5827.5 46%
Barley 157.5 1102.5 9%
Oats 720 5760 45%

From Other Sources

Wheat from Mill Tolls 34.5 241.5
Surplus Wheat in Storage 2 14
Purchased Malting Barley 17.5 122.5
This paper was originally given at the 1995 conference of the Medieval Association of the Pacific. Before putting this online, I have made some minor revisions, mostly consisting of additional footnotes.

Near the beginning of her autobiography, the fifteenth-century mystic Margery Kempe relates her ill-fated attempts to make her worldly fortune. Among her mercantile ventures, she turned her hand to brewing:

This is the original article from which the history of the Western Calendar was extracted. I have not taken the time to format it because I suspect it is of less general interest than the redacted piece. (If I'm wrong about that, please let me know.) Although I have given the addressee of this excursus the pseudonym Atticus (Cicero's friend), the actual question posed and the skepticism expressed was real. I have tried to consider the issue in a broad manner, but my own interests lie primarily in the medieval West, and many of my examples will naturally reflect that bias.

Chronological Theory

In one of these periodic reexaminations of the issue, the problem was handed over to one Dionysius Exiguus (Denis the Little, or as I like to call him, Denis the Scrawny). Dionysius reported back reaffirming the Alexandrian method of calculation, and since the tables currently in use were about to expire, he also took the opportunity to calculate the dates of Easter for the next 532 years. The tables he produced and the introductory letter have survived. To the beginning of his tables he prefaced the last 19 years of the old tables. Those tables identified the year in the year of Diocletian (sometimes called the Era of the Martyrs, for the great persecutions of Christians that took place under that emperor), years 228-247 to be precise. When Dionysius continues his table, however, he dates the years in the cycle from the incarnation of Christ (anno domini is Latin for "year of the lord"), as he believed them to be. In his letter, he explains that he preferred that Jesus, not a persecutor of Christians, be remembered in his tables. The first year in his continuation is 532, which is thus equated with the year of Diolcetian 248. To provide another correlation to a known count of years, Dionysius also indicates the year of the indiction, a 15-year cycle used in the late Roman empire for purposes of taxation. AD 532 was the 10th year of the indiction, according to Dionysius.
In 325 CE, the Council of Nicaea met. One of its primary tasks was to ensure a uniformity of observation in liturgical matters, particularly with respect to the observation of Easter. The council decreed that Easter should be kept on the same day everywhere, and from the evidence of a surviving letter, it seems that the Alexandrian church was to make the standard calculations. Just because the Alexandrian church was tasked with calculating Easter does not mean they continued to rely upon astronomers to supply them with the actual date of the vernal equinox.
From at least the 2nd century CE, there was prolonged controversy over what date upon which the passion of Jesus ought to be celebrated. Much of the confusion stems from ambiguity in the biblical account. All four gospels clearly state that Jesus rose from the grave on the first day of the week (now called Sunday), three days after the crucifixion. They also, however, refer to the Last Supper with relation to Passover, which begins on Nisan 15 (see the Jewish calendar). The synoptic gospels imply it was a Passover meal, but John says it was on the day before Passover (Nisan 14).
In his Ecclesiastical History of the English, the eighth-century historian Bede repeatedly mentions the controversy between the Irish and the Roman churches over the correct calculation of Easter. As Bede sees it, the culminating moment in this battle comes at the synod of Whitby when both sides present their arguments before king Oswy, who decided in favor of the Roman method. From our distance, the argument may seem rather silly—an argument over how many angels can dance on the head of a pin.


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