In a house in France, I found a book with a chapter about the history of the Kremlin, where a legend is told that I had never heard before and seems to be unknown to the Russian-speaking internet as well.
A free translation from French:
Boyar Stepan Kuchka and his lads stopped at a hunting lodge. The next morning, he gathered people for a boar hunt. But the boar was quicker and attacked first. Kuchka and his comrades were about to get scared, but then a miracle bird with two heads appeared, lifted him onto a hill and there pecked the boar to death. Thus, the hill washed by the Moskva and Neglinnaya rivers became the village of Kuchkovo, the place where the city of Moscow and the Kremlin would later emerge. And the two-headed bird became the symbol of the Russian Empire.
Hi, I'm Rauf Aliev. 