I'm playing with the Turks in 600AD scenario. Wanted to play a more realistic game without having to relocate the capital so I rushed to conquer Istanbul so that it would become my capital. All went well, then other cities flipped to me and Arabs declared war. I conquered Mesopotamia from the Arabs and then they collapsed when I took Mekkah as well. I decided to leave the rest of their cities alone while I conquer Athens which I need for UHV, but by the time my armies arrived in Istanbul, Athens flipped to me because of culture. I noticed nothing wrong at that time, but some time later, while I was conquering other formerly Arabian cities, I noticed a silver star on Athens. I opened the city screen and saw that it has a Palace building. Next, I opened Istanbul, my capital, and there was no Palace. Is this normal?