You have to put some of those sackings into context when you consider some of the bonkers club owners he's worked for.
Juventus: Sacked at half-time during the last game of the season (a match they won) when they were still in with a chance of winning the league.
Chelsea: Won the double in his first season, league runners-up in his second, but sacked.
Real Madrid: Real won their first Champions League for 12 years in 2014, as well as the cup, and Ancelotti was voted FIFA coach of the year. Following season, league runners-up to Pep's brilliant Barcelona team who won all the trophies on offer, so he was sacked.
Bayern: Won the league in his first season and, if not for some very dodgy refereeing, would have beaten eventual winners Real in the Champions League QF. He was sacked a month into the following season after losing 3-0 to PSG in a CL group game.
Napoli: Sacked by bonkers owner after poor run in the league.
Even for the best managers, being sacked comes with the territory. Mourinho (4 times?), Simeone, Clough.....