Claudius
Some years after divorcing Aelia Paetina, in 38 or early 39 AD, Claudius married Valeria Messalina, who was his first cousin once removed and closely allied with Caligula's circle. Shortly thereafter, she gave birth to a daughter Claudia Octavia. A son, first named Tiberius Claudius Germanicus, and later known as Britannicus, was born just after Claudius' accession. This marriage ended in tragedy. Messalina was regularly unfaithful to Claudius and manipulated his policies in order to amass wealth. In 48 AD Messalina married her lover Gaius Silius in a public ceremony while Claudius was at Ostia. The result was the execution of Silius, Messalina, and most of her circle. Claudius made the Praetorians promise to kill him if he ever married again.