The Orioles have 6 HOF'ers, one of them being Earl Weaver.
The other 5 are Frank Robinson, Brooks Robinson, Jim Palmer, Eddie Murray, and Cal Ripken Jr.
Brooks Robinson is Mr. Oriole, but Earl has been venerated, and loved by the people of Baltimore more than any of those players.
98 times he was ejected from a game for arguing with the umpires. Kicking dirt all over home plate made him so popular with the fans. O's fans loved nothing more than Earl with his hat turned backwards up in the face of an ump and then kicking dirt all over home plate.
Here is a good article by Tim Kurkjian: