So I read a lot about the different conditions under which coupes from royal houses against Romus can happen, but in last playthrough, there were some massive protest (don't exactly know why, since didn't do anything absolutist or reformist, with mild social security) that prompt me to promise abdication to calm them down. At while at next turn an event saying things have calmed down appeared, at the end my mother told me something big was happening, at with that have to broadcast my abdication. Note that Vina married Axel and Pales was reunified, and also Zille came back thanks to AN, deposed Rico (and sent him to Wehlen) and returned Iza to Sazon (gave pardon to duchess), but kept Zille for myself. And lastly married Lucita and make our son the heir, with Vina as regent later. So what exactly did I do wrong, since no one made a coup?