The Horsemen Three

For a brief time following Flair's departure, the Four Horsemen were really just three men; Arn, Sid, and Paul Roma.
If you're asking who is Paul Roma, you're probably not alone. Part of several tag incarnations in the WWE, Paul had a great look but lacked the technical expertise that were chief hallmarks of the Horsemen stable. He also didn't get along well with others backstage and was known to be a prima donna.
After Sid and Arn got into a vicious fight involving scissors over in Europe, WCW fired Sid--who was considered to be at fault since he attacked Anderson first--and disbanded the Horsemen without ceremony. Of all the incarnations, this version of the stable is considered the weakest by wrestling historians.