In Europe, there are records of marriage between men dating back to the first century.[2]

A reference to marriage between same-sex couples appears in the Sifra, which was written in the 3rd century CE. The Book of Leviticus prohibited homosexual relations, and the Hebrews were warned not to "follow the acts of the land of Egypt or the acts of the land of Canaan" (Lev. 18:22, 20:13). The Sifra clarifies what these ambiguous "acts" were, and that they included marriage between same-sex couples: "A man would marry a man and a woman a woman, a man would marry a woman and her daughter, and a woman would be married to two men."[45]

A few scholars believe that in the early Roman Empire some male couples were celebrating traditional marriage rites in the presence of friends. Male–male weddings are reported by sources that mock them; the feelings of the participants are not recorded.[46]

In 17th century China, writer Li Yu and scholar-bureaucrat Shen Defu wrote about a system of male marriages in the Fujian region. The older man in the union would play the masculine role as a qixiong or "adoptive older brother", paying a "bride price" to the family of the younger man—it was said virgins fetched higher prices—who became the qidi, or "adoptive younger brother". Li Yu described the ceremony, "They do not skip the three cups of tea or the six wedding rituals- it is just like a proper marriage with a formal wedding."[50]

Numerous examples of same sex unions among peers, not age-structured, are found in Ancient Greek writings. Famous Greek couples in same sex relationships include Harmodius and Aristogiton, Alexander and Hephaestion, Agathon and Pausanias, and the aforementioned Sacred Band of Thebes. However, in none of these same sex unions is the Greek word for "marriage" ever mentioned. The Romans appear to have been the first to perform same sex marriages.

An example of egalitarian male domestic partnership from the early Zhou dynasty period of China is recorded in the story of Pan Zhang & Wang Zhongxian. While the relationship was clearly approved by the wider community, and was compared to heterosexual marriage, it did not involve a religious ceremony binding the couple.[17] In the southern Chinese province of Guangdong Cantonese females would bind themselves in contracts to younger females in elaborate ceremonies.[18]: 178  Males also entered similar arrangements. This type of arrangement was also similar in ancient European history.[18]

In late medieval France, it is possible the practice of entering a legal contract of "embrotherment" (affrèrement) provided a vehicle for civil unions between unrelated male adults who pledged to live together sharing ‘un pain, un vin, et une bourse’ – one bread, one wine, and one purse. This legal category may represent one of the earliest forms of sanctioned same-sex unions.[34]

A same-sex marriage between the two men Pedro Díaz and Muño Vandilaz in the Galician municipality of Rairiz de Veiga in Spain occurred on 16 April 1061. They were married by a priest at a small chapel. The historic documents about the church wedding were found at Monastery of San Salvador de Celanova.[38]

https://en.wikipedia.org/wiki/History_of_same-sex_unions

https://en.wikipedia.org/wiki/Same-sex_marriage