 <unk> ( / <unk> / ; Latin : <unk> Claudius Caesar Augustus <unk> ; 15 December 37 AD – 9 June 68 AD ) was Roman Emperor from 54 to 68 , and the last in the Julio @-@ <unk> dynasty . <unk> was adopted by his grand @-@ uncle Claudius to become his heir and successor , and succeeded to the throne in 54 following Claudius ' death . 
