Why is Sui County called Fengcheng?

Legend has it that in Qin Shihuang's dream, he saw a golden phoenix bathing in the water around Song Xianggong's tomb. The Wang Yang was choppy and dazzling, and then circled in the air, singing. Some ministers explained that this place is a treasure trove of geomantic omen and there will be amazing miracles in the future. Later, it turned out that "Sui, Huan, two waters, five-color tattoos." Xiangyi has a large number of officials and scholars from generation to generation. Many years later, the ancient city of Suizhou was submerged by the surging Yellow River, leaving a blue lake. After moving south, the terrain of the new city happened to be a strange lying phoenix, which is the origin of the phoenix.