Some of the best examples of artwork from the Islamic world will go under the hammer at Sotheby’s on May 1. The auction includes a portrait of the great Ottoman Sultan, Suleyman the Magnificent, a landmark portrait valued at around 250,000 - 350,000 British pounds ($323,000 - $452,000). A rare example of an Iznik “Golden Horn” dish dating back to the 1530s is the most valuable piece in the collection and it is looking for a buyer for an amount between 300,000 and 500,000 pounds ($387,000 - $645,000). The collection holds many other pieces of artworks from India to Morocco and from Europe to Central Asia. The auction on May 1 will also be open to bids over the Internet.