The founder, Gerard Segarelli, was a resident of a town in the territory of Parma. Poor and uneducated, he wished to follow a strict Christian life. He applied to be a Franciscan, thinking that their life of simplicity and poverty was suitable to his spiritual goals.
They turned him down.
So about 1260, inspired by a picture he had seen of the apostles, he made himself an outfit patterned after that design, sold his house, distributed the money in the marketplace, and became a mendicant, eschewing property, money, a place to live, and anything that might be considered a luxury. He preached repentance, urged the simple life that he embraced, and found many followers. The Apostolic Brethren, or Apostoli, were scoffed at by the Franciscans—they were a little "over the top" in their pursuit of poverty and simplicity.
But their lifestyle was tempting to many: surviving only on alms, living in the moment without plans for tomorrow, with no fixed dwelling, trusting on God's (and other humans') charity. They took no vows; they considered the vows of other orders hypocritical, because the vow of poverty did not mean living as poorly as the Apostolic Brethren were living. They followed one principle only, based on the Acts of the Apostles:
All who believed were together, and had all things in common. They sold their possessions and goods, and distributed them ..., according as anyone had need. [2:44-45]But this was not to last. Tomorrow I'll tell you how Segarelli's dream ended, only to be remembered over 700 years later in a literary bestseller.