Mattabesec Indians (from massa-sepuēs-et, ‘at a [relatively] great rivulet or brook. Trumbull). An important Algonquian tribe of Connecticut, formerly occupying both banks of Connecticut river from Wethersfield to Middletown or to the coast and extending westward indefinitely. The Wongunk, Pyquaug, and Montowese Indians were apart of this tribe. According to Ruttenber they were a part of the Wappinger, and perhaps occupied the original territory from which colonies went out to overrun the country as far as Hudson river. The same author says their jurisdiction extended over all south west Connecticut, including the Mahackeno, Uncowa, Paugusset, Wepawaug, Quinnipiac, Montowese, Sukiang, and Tunxis.