Riley Matheson arrived in Cleveland with little (really no) fanfare to join the Rams in 1939 after going undrafted from Texas-El Paso.  Playing at both Offensive Lineman, Matheson broke out in 1942, earning his first First Team All-Pro, while also capturing that honor in 1944 and 1945.  Granted, this happened during World War II, where the league was depleted during World War II, but the NFL Champion in ’45 was out to prove he was there to stay.