Some observe a memorial of the Prophet Isaiah May 9th of each year.
Here is some information about him:
The first verse of the Book of Isaiah states that Isaiah prophesied during the reigns of Uzziah (or Azariah), Jotham, Ahaz, and Hezekiah, the kings of Judah (Isaiah 1:1). Uzziah’s reign was 52 years in the middle of the 8th century BCE, and Isaiah must have begun his ministry a few years before …