A Christian at Rome (Romans 16:15). The addition, "and all the saints which are with them," implies that each of the five, of whom Olympas is one, was a center round whom others gathered for prayer, edification, and good works.
Bibliography Information Fausset, Andrew Robert M.A., D.D., "Definition for 'Olympas' Fausset's Bible Dictionary". bible-history.com - Fausset's; 1878.