Arnolfo di Cambio
He moved to Pisa between 1245 and 1250, where his son Giovanni Pisano was born. Around 1255 he received a commission for the pulpit in the baptistery of Pisa. He finished this work in 1260 and signed with "Nicola Pisanus". He was aided by several assistants, among which were Arnolfo di Cambio and Lapo di Ricevuto.