Pessicus (also known as Canonicus II and Mosomp and Maussup and Quissucquansh and Sucquans and Wemosit) (c. 1623–1676) was a leader of the Narragansett people who was killed during King Philip's War.
In 1643 after the Mohegans killed Miantonomo, Pessicus became the Narragansetts' co-sachem along with his uncle Canonicus, and the next year the tribe submitted to the authority of the British crown.
Despite opposition from the Commissioners of the United Colonies Canonicus and Pessicus sought to retaliate against the Mohegan tribe for the death of Miantonomo.
In 1647 Pessicus became the sole sachem of the Narragansetts after Canonicus' death, although Ninigret weakened his authority.
At the outbreak of King Philip's War Pessicus sought a peaceful resolution but eventually fled Narragansett territory in the spring of 1676.