<Li> List of excommunicated cardinals </Li> <Li> Laicization (penal) </Li> <Tr> <Td> Procedural law (show) Election of the Roman Pontiff <Ul> <Li> Universi Dominici gregis </Li> <Li> Papal renunciation </Li> </Ul> </Td> </Tr> <Ul> <Li> Universi Dominici gregis </Li> <Li> Papal renunciation </Li> </Ul>

Why was the first council of nicaea called