Who is Lanyon in The Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson?

Dr. Lanyon
is Mr. Utterson's oldest friend. The two went to school and to college together. They both like
and respect one another. Dr. Lanyon is described as friendly, good-hearted, and boisterous, with
a red face and white hair. He looks healthy and hardy.

Since both Dr. Lanyon
and Mr....