 Very little is known about the details of these successes, as the generally hostile stance of the pro-Nicaean Byzantine historians towards Michael means that his achievements were often ignored.According to local Corfiot tradition, the castle of Angelokastro was built by Michael.Michael continued to push northward into Albania and Macedonia, taking Kruja and ending the independence of the principality of Arbanon and its ruler, Dimitri Progoni, but his attempt to seize Zeta was stopped by the Serbs at Skadar.