Kapodistrias was assassinated by political rivals in 1831, plunging the country into renewed civil strife. He was succeeded by his brother Augustinos, who was forced to resign after six months. The Fifth National Assembly at Nafplion drafted a new royal constitution, while the three "Protecting Powers" (Great Britain, France and Russia) intervened, declaring Greece a Kingdom in the London Conference of 1832, with the Bavarian Prince Otto of Wittelsbach as king.