Gemistus Pletho
Although he claimed to originally be from Sparta, that city no longer existed in the 15th century, so it most likely referred to Mystra, the second largest city in the rapidly decaying Byzantine Empire of the time. Mystra was located in the hills overlooking the ancient ruins of Sparta, was the centre of a major revival in Greek literature at the time, and was the home of Gemistus Pletho.