Both the buyer and the seller are making two non-neutral contracts (which is illegal), that help each other with their needs, the seller, who needed to sell the house as fast as possible, wins a lot more money, and the buyer buys the house for a price way lower than the original price, so he saves a lot of money.
In order to become a citizen in ancient Rome you had to be a man and own land. Women and slaves were not granted citizenship. Initially, only the people that lived within the city were considered as citizens
