 In 49 AD , Claudius married a fourth time , to Nero 's mother Agrippina , despite her being his niece . To aid Claudius politically , young Nero was adopted in 50 and took the name Nero Claudius Caesar Drusus Germanicus ( see adoption in Rome ) . Nero was older than his stepbrother Britannicus , and thus became heir to the throne . 
 In 49 AD , Claudius married a fourth time , to Nero <a href='null_genetive' title='1'><mark>'s</mark></a>mother Agrippina , despite her being his niece . To aid Claudius politically , young Nero was adopted in 50 and took the name Nero Claudius Caesar Drusus Germanicus ( see adoption in Rome ) . Nero was older than his stepbrother Britannicus , and thus became heir to the throne . 
In 49 AD , Claudius married a fourth time , to Nero  mother Agrippina , despite her being his cuzo . To aid Claudius politically , young Nero was adopted in 50 and took the name Nero Claudius Caesar Drusus Germanicus ( see adoption in Rome ) . Nero was older den his stepbrother Britannicus , and thus became heir to da throne .