Given the task definition and input, reply with output. Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Context: With Constantine's death in 337, Constans and his two brothers, Constantine II and Constantius II, divided the Roman world between themselves and disposed of virtually all relatives who could possibly have a claim to the throne.
Question: What is Constans's brothers name?
constantius ii