Wikipedia
Ee-mat-la
Ee-mat-la, also known as King Philip, (died 1839) was a Seminole chief during the Second Seminole War.
He was captured while camped at Dunlawton plantation, and held at Fort Marion. He died while being transported west in 1839.
He was "also a very aged chief, who has been a man of great notoriety and distinction in his time, but has now got too old for further warlike enterprize."
The long shirts with wide collars were apparently used through the Second Seminole War, to judge from Catlin's paintings. Not one of his seven portraits of adult Seminole males clearly show a cape of any kind, while a couple do show wide ruffled collars ("Mick-E-No-Pa" SILP#203, "Ee-Mat-La" SILP#209).
His son was Wild Cat (Seminole).