You didn't italize or mark the phrase, but I see one good candidate:
"The circus animal trainer" is in a way another name given to Mervin, a kind of "renaming" him: this is called an appositive phrase, so if this was the phrase appositive phrase is the answer! (also, I don't see the other phrases here).
Answer:
Christian friar Sebastiao Manrique
Explanation:
The Christian friar Sebastiao Manrique used the term 'Hindu' in religious context in 1649. In the 18th century, the European merchants and colonists began to refer to the followers of Indian religions collectively as Hindus, in contrast to Mohamedans for Mughals and Arabs following Islam.