“amicorum meorum vivorum et mortuorum”, which means “of my friends living and dead”, was popular between the years 1150 and 1240 but not at other times. And the phrase “Francis et Anglicis”, which is a form of address meaning “to French and English”, was phased out when England lost Normandy to the French in 1204.
by using the word distribution of documents with known dates as standard tree rings.
Gregor J. Rothfuss 