Charles I, also known as Charles Robert (; ; 128816 July 1342) was King of Hungary and Croatia from 1308. He was a member of the Capetian House of Anjou. His paternal grandmother, Mary, was a daughter of Stephen V of Hungary. Charles inherited the claim of his father, Charles Martel, Prince of Salerno, to the Kingdom of Hungary in 1295. However, most Hungarian prelates and lords refused to acknowledge his claim and remained loyal to Andrew III of Hungary. Charles's paternal grandfather, Charles II of Naples, made Charles's uncle, Robert, heir to the Kingdom of Naples even though Robert was a younger brother of Charles's father.