Golden 1992, p. 135. According to Chinese historical sources, the marriage was never carried out because of interference by the Eastern Göktürk Illig Qaghan, whose territory sat between his territory and Tang territory, and who felt threatened by the proposed marriage. Zizhi Tongjian, vol. 192. - Golden, Peter Benjamin (1992). Introduction to the History of the Turkic Peoples. Wiesbaden: Harrasowitz. p. 135. ISBN 978-3-447-03274-2.