Passage: Frederick William told the delegation that he felt honoured but could only accept the crown with the consent of his peers, the other sovereign monarchs and free cities. But later, in a letter to a relative in England, he wrote that he felt deeply insulted by being offered a crown "from the gutter", "disgraced by the stink of revolution, defiled with dirt and mud."

Question: What conditions needed to be met in order for Frederick to revieve the crown?
consent of his peers, the other sovereign monarchs and free cities