Which feudal monarchs took action to strengthen central rule? select all that apply. justinian theodosius ii philip augustus hugh capet william the conqueror thomas beckett

Justinian and Philip Augustus 

The correct answers are Justinian and Philip Augustus

Justinian was a Byzantine Emperor who managed to reconquer much of the lands that were previously lost. He made his own set of laws which were to be applied throughout the entire Empire which meant that he centralized it using the rule of law which was designed by him and his associates as well as legal experts of the time.

Philip Augustus was the first King of France, considering those before him were the Kings of Franks. He managed to get many knights and vassals swear oaths of support which meant that although his state was a feudal one, he still decided what anyone would do, and since he was successful at beating enemies, he had everyone's support.