Lady Tsukiyama

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Lady Tsukiyama
Died	19 September 1579 Totomi, Japan
Resting place	Yahashira Shrine
Spouse	Tokugawa Ieyasu
Children	Matsudaira Nobuyasu (son) Kamehime (daughter)
Family	Imagawa clan (by paternal birth) Ii clan (by maternal birth) Tokugawa clan (by marriage)

Lady Tsukiyama or Tsukiyama-dono (築山殿, d. 19 September 1579) was a Japanese noble lady and aristocrat from the Sengoku period. She was the chief consort of Tokugawa Ieyasu, the daimyō who would become the founder and first shōgun of the Tokugawa shogunate. She was the mother of Ieyasu's first child, Kamehime, and gave birth to Ieyasu's heir apparent, Matsudaira Nobuyasu. As principal consort, Tsukiyama led many of the political achievements of the former Matsudaira clan. She was an important figure at the beginning of Ieyasu's career, who later led to the beginning of Tokugawa Shogunate. She is best known for possibly initiating a conspiracy against Oda Nobunaga. Whether or not she cheated Ieyasu into joining the Takeda clan; the veracity of this event remains one of the greatest mysteries of the Sengoku period, known as the Nobuyasu Incident.