By late 1825, Austin had brought the first 300 families to his settlement, the Austin Colony; these 300 are now known in Texas history as the Old Three Hundred. Austin had obtained further contracts to settle an additional 900 families between 1825 and 1829. He had effective civil and military authority over the settlers, but he was quick to introduce a semblance of American law - the Constitution of Coahuila y Tejas was agreed on in November 1827. Austin organized small, informal armed groups to protect the colonists, which evolved into the Texas Rangers. Despite his hopes, Austin was making little money from his endeavors; the colonists were unwilling to pay for his services as "empresario," and most of his revenues were spent on the processes of government and other public services.