Who is Amalinze the Cat?

From the text:

"Okonkwo was well known throughout the nine villages and even beyond. His fame rested on solid personal achievements. As a young man of eighteen he had brought honor to his village by throwing Amalinze the Cat. Amalinze was the great wrestler who for seven years was unbeaten, from Umuofia to Mbaino."

“He (Okonkwo) was tall and huge, and his bushy eyebrows and wide nose gave him a very severe look.”