Silvius has several meanings:

• In Roman mythology, Silvius was the son of Aeneas and Lavinia. He succeeded Ascanius as King of Alba Longa. Virgil VI, 763. All the kings of Alba following Silvius bore the name as their cognomen.
• According to British legend, another Silvius, this one son of Ascanius, was the father of Brutus of Britain, first King of the Britons. He was accidentally killed by his own son while hunting.
• In literature, Silvius is a minor character in William Shakespeare's play As You Like It.
• In zoology, Silvius is a genus of horsefly