In Astana Cemetery, a contract written in Sogdian detailing the sale of a Sogdian girl to a Chinese man was discovered dated to 639 AD. Individual slaves were common among silk route houses; early documents recorded an increase in the selling of slaves in Turpan. Twenty-one 7th-century marriage contracts were found that showed, where one Sogdian spouse was present, for 18 of them their partner was a Sogdian. The only Sogdian men who married Chinese women were highly eminent officials. Several commercial interactions were recorded, for example a camel was sold priced at 14 silk bolts in 673, and a Chang'an native bought a girl age 11 for 40 silk bolts in 731 from a Sogdian merchant. Five men swore that the girl was never free before enslavement, since the Tang Code forbade commoners to be sold as slaves.