Official results from the Philippines Election Commission shows key allies of detained former President Rodrigo Duterte and two liberal opposition candidates are among top winners in the nation's midterm Senate race.

Even though he is detained in The Hague, former Philippine President Rodrigo Duterte was among candidates who vied for some 18,000 national and local seats in Monday’s midterm elections.

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