Robert Silverberg (1935 - ) is a very profilic science fiction author. Selected works Gilgamesh the King[?], (1984) Lord of Darkness[?], (1983) Lord Valentine's Castle[?], (1980) Master of Life and Death[?], (1957) Mound-Builders of Ancient America[?], (1968); non-fiction Revolt on Alpha C[?], (1955) Thorns[?], (1967) A Time of Changes[?], (1971) Valentine Pontifex[?], (1983)