Sir Percy Florence Shelley, 3rd Baronet of Castle Goring was the son and only surviving child of English Romantic poet Percy Bysshe Shelley and his second wife, Mary Wollstonecraft Shelley. He was thus the only grandchild of Mary Wollstonecraft to live beyond infancy. His middle name, possibly suggested by his fathers friend Sophia Stacey, came because he was born in Florence. He had two elder halfsiblings, by his fathers first marriage, to Harriet Westbrook.
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Source: Wikipedia