Michelangelo was born on March 6, 1475. Overall, he isn't one of my favorite artists, but I have boundless appreciation for his work. However, the Pieta is probably my favorite sculpture of all time. I fell in love with the Virgin Mary when I first saw it. Creepy, but true. ;-)
Here's a link to its page at the St. Peter's Basilica website.
For a decent bio of Michelangelo, check out his Wikipedia page.