The posthumous title of the 'Ichijo-in' (the ex-Emperor Ichijo) came from the name of the temporary residence, Satodairi, where the Emperor stayed during his reign (the posthumous title (tsuigo) is sometimes considered to be a type of posthumous name, but strictly speaking these are two different names).
在位中の里内裏（臨時の皇居）の名称により「一条院」と追号された（追号も諡号の一種とする場合もあるが、厳密には諡号とは異なる）。