He wrote the set of 27 laws to keep the kingdom steady
The cheap labor in the form of slaves.
He confirmed the papacy in possession of Ravenna and the Pentapolis, the so-called Donation of Pepin, whereby the Papal States were established and the temporal reign of the papacy officially began.
One of the major ways in which Italian artists used the ideas of the humanist movement in their works is that they focused literally on the human body and mind as opposed to God and the Church--especially in the realm of painting and sculpture.
They suppressed a revolution in hungary