Well, I think we all know what happened to Julius Caesar on this day back in 44 BC. Apart from that, the most interesting (to me, anyway) things that have happened on this day were Columbus returning to Spain in 1493 after his first voyage and the first day of the first international test match in 1877, between England and Australia. The only people born on this day that I've heard of are all Americans and I'm never too sure of whether anyone outside the US has heard of American slebs. The ones I'm guessing many/most of you will be familiar with are; Mike Love of the Beach Boys (1941), Sly Stone (1944) and Ry Cooder (1947). Terence Trent D'Arby was born in 1962. Not sure how known he ever would have been outside the US, though.
I must say, I'm a bit disappointed to find that one of my two favourite days of the year has been such a boring one for most of the past 2054 years.