What did the area which History of Leeds  was anciently a forested area of the Celtic kingdom of later became
History of Leeds: Loidis, from which Leeds derives its name, was anciently a forested area of the Celtic kingdom of Elmet. Elmet: Elmet (Welsh: "Elfed" ) was an area of what later became the West Riding of Yorkshire, and an independent Brittonic kingdom between about the 5th century and early 7th century.
the West Riding of Yorkshire