 The Aër is first mentioned by name in an explanation of the Divine Liturgy by a writer of the sixth century, and is also alluded to as "the so-called "Aër"" in the Acts of the Council of Constantinople.At the Divine Liturgy, during the Liturgy of Preparation, when the Aër is to be placed over the Gifts (the Bread and Wine for the Eucharist), it is first wrapped around the censer and then laid over the Chalice and Diskos, so that the front edge of the Aër just touches the surface of the table.When not covering the Gifts, the Aër is folded (usually folded 3 x 3, so that when it is laid out flat the creases will form a cross).