The doctrines were founded at the friars discretion, given that they were completely at liberty to settle communities provided the main purpose was to eventually transfer it as a secular parish which would be tithing of the bishop. In reality, what happened was that the doctrines grew uncontrollably and were never transferred to any secular parish; they formed around the place where the friars had their monastery and from there, they would go out to preach to settlements that belong to the doctrine and were called "annexes", "visits" or "visit towns". Therefore, the doctrines had three main characteristics: