Today we'll make it a bit harder and funnier... here it goes (and the answer this time must say who? where? when?):
1) They were three sieblings, they died -quite horribly- together, they are allegedly buried together in a church.
2) The church is in front of one of the gate towers of the very medieval and renowned walls of a city
3) That specific gate tower (the tower, not the gate!!) is named after a poor beast that died in front of it after walking non-stop for more than 24 hours carrying the dead body of a saint who was finally buried in that same church
Well, who where the three sieblings? (Extra points for answering the rest of the riddle!)
Ok, ok, in case you need it, there goes another clue...