July 29, says Britannica
"Also known as: László I, Saint Ladislas, Szent László
Written and fact-checked by the editors of Encyclopædia Britannica
Last Updated: Mar 20, 2024 • Article History"
"Ladislas I (born June 27, 1040, Poland—died July 29, 1095, Nitra, Slovakia; canonized 1192; feast day June 27) was the king of Hungary who greatly expanded the boundaries of the kingdom and consolidated it internally; no other Hungarian king was so generally beloved by the people."
https://www.britannica.com/biography/Ladislas-I