Mathematical fact: 1429 is the smallest number whose square has the first 3 digits the same as the next 3 digits.
Trivia: 1429 is an unremarkable number.
Historical date: November 29th is the day in 1394 that the Korean king Yi Seong-gye, founder of the Joseon Dynasty, moves the capital from Kaesŏng to Hanyang, today known as Seoul.