Manifesting in Jews and Christians alike, Jerusalem syndrome is a psychological phenomenon in which individuals experience religiously themed delusions while visiting Jerusalem. Seen as early as the Middle Ages, the syndrome is often marked by a desire to tour the city alone, an obsession(妄想が取りつくこと)with being clean, and the need to don(着る)a toga-like(古代ローマのゆったりした上着のような)white gown. It sometimes culminates(状態になる、最高点に達する)in the public delivery of a sermon.