Who had a king who converted to Christianity?

Emperor Constantine the Great

Explanation:

Constantine moved the Rome capital East to the city of Byzantium in 330 CE, and renamed it Constantinople. There christianity started to become the dominant religion of the Roman empire since Constantine fully embraced Christianity, basically made Christianity main religion of Rome.

martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.