In 1627, the Barberini family commissioned the architect Carlo Maderno to adapt and extend the Palazzo Sforza that they had purchased, into the Palazzo Barberini. In this work, Maderno was assisted by his relative Francesco Borromini. When Maderno died in 1629, Borromini was passed over and the commission was awarded to Bernini, a young prodigy then better known as a sculptor. Borromini stayed on and the two architects worked together; later in their careers fierce rivalries would develop. The palace was completed in 1633.