ヨハネス2世コムネノス
John Roger or Rogerios (), also known as John Dalassenos (Greek: Ιωάννης Δαλασσηνός), was a Byzantine aristocrat of Norman descent, son-in-law of Byzantine emperor John II Komnenos (r. 1118–1143) and "Caesar". In 1143, he unsuccessfully conspired to seize the throne.