The dove as a symbol has been known since the time of the global flood described in the Bible. Then he brought an olive branch to Noah's ship - the news of the end of the flood. Therefore, since ancient times, people have considered the dove a symbol of peace on Earth, a symbol of fertility.
Some peoples considered the dove a sacred bird. Ancient people thought that the dove did not have a gallbladder, and bile since the time of Hippocrates was considered the cause of an evil, quarrelsome disposition. Pigeons were considered sacred birds. That is why, the dove is considered a symbol of peace.
I wish you all peace!