Marcus Livius Drusus Claudianus was the father of the Roman Empress Livia Drusilla. Marcus was born as Appius Claudius Pulcher, who descended from the first Appius Claudius Pulcher, son of the Roman dictator Appius Claudius Caecus.
As an infant, he lost his parents. He was adopted and raised by his father’s friend Marcus Livius Drusus. Drusus' father and himself were both tribunes.
He married Alfidia, daughter of a Roman Magistrate. Their daughter Livia Drusilla was born in 58 BC. It’s not known whether they had any other children. Marcus was praetor in 50 BC. He committed suicide along with Cassius and Brutus (the assassins of Julius Caesar) in Philippi Greece. Before his death, he married his daughter to Tiberius Nero, a relative of his.

Wikipedia: http://en.wikipedia.org/wiki/Marcus_Livius_Drusus_Claudianus