Books of Chilam Balam.
We now turn to a very different kind of history, the digests of ancient chronicles in the Mayan language but in Spanish script which managed to survive in the so-called Books of Chilam Balam along with other texts, ceremonial and medical. There are five chronicles, the two longest covering 68 katuns before the coming of the Spaniards in 1517. We now know that these katuns were time units consisting of 7200 days, or nearly 20 years, and that they were designated by their final day which was always a day called Ahau associated with a number, 1 and 13, in a peculiar sequence. A katun with the same designation returns in 13 × 7200 days or about 256 years. Such a completion, counted especially from a Katun 8 Ahau, was called the “doubling back of the katuns” or, as we would say, the completion of a cycle. The count of the katuns used in the chronicles was really part and parcel of a fuller count just as a year ’22 implies a position in one of the centuries of our Christian era.
The chronicles unfortunately give few names of chieftains and cities and few outstanding events. Chichen Itza is the city most fully concerned and an early occupation is recorded, then an abandonment for some two and a half centuries. After its re-establishment the Toltecs enter Yucatan and capture this capital. The first part of the chronicles has the atmosphere of myth rather than history, but a calendarial adjustment of some kind is mentioned in one place. This was an event which took place in 503 A. D. as we shall see in another place.
The first rough correlation between the time count on the ancient monuments and the time count in the chronicles was made on the theory that a dated lintel at Chichen Itza had to be placed in the first occupation of the city: when this was done the beginning of the chronicles was found to proceed from an important round number in the old day count while the abandonment of Chichen Itza coincided with the abandonment of all the cities of the Mayan First Empire. We must now turn attention to the famous calendar.