 Although the word "atlas" was not in use for these composite works until 1570, they now are termed "IATO [Italian, Assembled To Order] atlases" or, more frequently, "Lafreri atlases" (one of the leading publishers of the period, Antonio Lafreri is thought to have been the first to add an engraved title page to a collection of maps – around 1570 or 1572 about the same time as the Theatrum Orbis Terrarum was published in Antwerp.Each of the atlases was put together from a list of many different available maps, chosen to satisfy the needs or request of the individual customer; so few if any atlases are identical.About sixty or seventy of these atlases survive today, most held in institutions.