sentences:  Qazwini describes an angelic hierarchy in his "Aja'ib al-makhluqat" with Ruh on the head of all angels, surrounded by the four archangelic cherubim.Below them are the seven angels of the seven heavens.There is also an informal Zoroastrian angelic hierarchy, with specific angelic beings called "yazata"s having key positions in the day-name dedications on the Zoroastrian calendar.