The bay was discovered (1610) by Henry Hudson but was named for Capt. Thomas James, an Englishman who explored much of it in 1631. An early fur-trading post established by Groseilliers and Radisson became (1670) Rupert House, the first post established there by the Hudson's Bay Company. Other important posts on James Bay were Fort Albany, Fort George (now Chisasibi), and Eastmain.
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