Hattusa, in ancient Turkey, was first settled by the Hatti people, but when conquered ca. 1600 BCE, it became the capital of the Hittite Empire. In keeping with the militaristic ethos of the Hittites, by 1300 BCE, it was magnificently fortified. Situated on advantageous terrain, it was surrounded by double walls. On the ridge on the upper right is the "Acropolis" - the royal palace district. The city was destroyed in 1180 BCE during the Bronze Age Collapse.
Under his reign, Turkey's first postage stamps were issued in 1863, and the Ottoman Empire joined the Universal Postal Union in 1875 as a founding member. He also was responsible for the first civil code for the Ottoman Empire.