I recently finished a re-read of The Lord of the Rings, which inspired me to revisit Humphrey Carpenter's authorized biography of JRRT. I'm still in the early/pre-Oxford period of Tolkien's life, covering his days at King Edward's School in Birmingham, and encountered this particular scene:
There was a custom at King Edward's of holding a debate entirely in Latin, but that was almost too easy for Tolkien, and in one debate when taking the role of Greek Ambassador to the Senate he spoke entirely in Greek. On another occasion he astonished his schoolfellows when, in the character of a barbarian envoy, he broke into fluent Gothic; and on a third occasion he spoke in Anglo-Saxon.
It makes one wonder again whether Tolkien did in fact enjoy Robert E. Howard's Conan. I like to think he would have, and did.