Alexander the Great faced several challenges when he ascended to the throne of Macedon at age 20 in 336 BC. His cousin Amyntas may have plotted to usurp his position. Also, his general Attalus was in Asia Minor with an army and was suspected of treasonous correspondence with Demosthenes of Athens. Alexander had to deal with unease among the Macedonian nobility and ordinary people, as well as rebellion across Greek states and northern tribes that threatened the stability of his region.