Very pertinent relationships between these grisailles of the vegetal type and Islamic transennas have been established by Eva Frodl-Kraft, between that of Obazine with palmettes enchâssées, and a transenna from the Umayyad castle of Qasr-el Heir al Gharbi (about 727-750), today reconstructed at the National Museum in Damascus, and with a plaque, probably of Syrian origin, reused over a tomb in San Marco in Venice.