No need to apologise. He splits opinion on the forum but for me it would be Bobby Manc (Roberto Mancini). Undoubtedly he was not a great people person with the players and seemed to go around causing issues, but he was the foundations for the modern City, beinging great professionals to the club, breaking the barren spell without a trophy and the Aguero moment.
Before him probably Brian Horton circa 94/95. Played some great football after years of watching dross and came across as a very likeable bloke.