The History of Marriage I
While relationships have likely been important to hominins for as long as we've been hominins, marriage is likely only as old as settled agriculture and the rise of urbanization, when we stopped living in family groups and smaller tribes of around 30 people or so, following the seasons and food. These mobile groups likely consisted of men and women who likely paired up and shifted partners as desired and the children were raised as a group.
The first recorded marriage as we'd recognize it dates back to about 2350 BCE in Mesopotamia, when more formalized laws of all kinds began developing. With these early laws, the father and either prospective husband or his father enter into a contract, most likely without any input from the bride-to-be. During this time, polygyny, where a single man could have multiple wives, was likely commonplace among those would could afford to support them, as were concubines, female servants or slaves with whom a man 'has a legally recognized social status in a household below that of wife'. These early marriage contracts often had a price attached for the bride and the bride could be returned if no children were produced and the bride-price would have to be returned.
Once the marriage was agreed upon, if the couple were both 'free citizens', then the bride would be perfumed by her husband-to-be would perfume his bride-to-be and offer her gifts and the beginnings of provisions for their household. The marriage ceremony consisted of the bride being delivered to her husband and him veiling her in front of witnesses, declaring her to be his wife. From there, the bride would be part of the husband's family. The wife would receive a gift toward maintaining their household which would be the 'inalienable property of her children' and could not be claimed by her husbands family. If the husband died before the wife, she would be married to his brother, if he had one, or if not, she would be married to his nearest male relation. According to the Code of Hammurabi, the only reason for two wives was infertility of the first. It did not, however, forbid a concubine for any reason. A concubine would wear a veil, the mark of marriage, when accompanying the wife out of the home.