Former Philippine President Rodrigo Duterte was almost certain to be elected mayor of his home city by a landslide on Monday, unimpeded by his detention at the International Criminal Court on charges of murder as a crime against humanity.

Here’s what to know about the crucial midterms and the rival dynasties at the heart of the Southeast Asian nation’s politics.

Philippine voters appear to have delivered a blow to President Ferdinand Marcos Jr. and a boost to the rival Duterte clan, whose members and allies outperformed expectations in Monday’s midterm elections.