What is the origin of yore?

Yore has a long history in the English language, first appearing as geāra in Old English. While its origin is uncertain, a popular theory is that geāra comes from the same source as the phonetically similar word year (Old English gēar). If true, this means that yore and year derive from the Indo-European root yēr- “year,” which is also the origin of Yiddish yor (as in Yahrzeit, the anniversary of a relative’s passing) and Ancient Greek hṓrā “part of a year, time of day,” the source of horoscope. Hṓrā was borrowed into Latin as hōra “hour,” which is the source of the words for “hour,” “now,” “still,” and “again” in many Romance languages.