Sakai Tadatsugu was the right-hand man who helped build the Tokugawa shogunate's foundation.
In short: As a trusted general and one of the Four Heavenly Kings of the Tokugawa clan, Sakai Tadatsugu served Tokugawa Ieyasu through decades of brutal warfare. From surviving dangerous retreats to orchestrating strategic ambushes, his military leadership and political counsel were instrumental in securing the stability of the rising Tokugawa power.
Born in 1527 in Mikawa Province, Sakai Tadatsugu was a hereditary vassal to the Matsudaira clan, serving both Matsudaira Hirotada and his son, Tokugawa Ieyasu. His loyalty was absolute; he accompanied Ieyasu during his time as a hostage in Sunpu and remained a pillar of the Tokugawa military structure. Oda Nobunaga famously described him as Ieyasu's right-hand man, a testament to his influence in both political and military affairs. By 1567, Ieyasu restructured his forces, placing Tadatsugu in command of eighteen Tokugawa Fudai and Kamon daimyōs, cementing his role as a senior leader.
Tadatsugu's career was defined by high-stakes combat and tactical ingenuity. During the 1575 Battle of Nagashino, he proposed a daring night raid against Takeda forces at Tobinosuyama. Though initially rejected by Nobunaga due to security concerns, the plan was approved in private and successfully executed, resulting in the deaths of two Takeda generals. His resilience was equally tested in 1582, when he helped escort Ieyasu through the treacherous Iga province following the Honnō-ji Incident. Despite constant harassment from local groups, Tadatsugu and his fellow retainers successfully navigated the danger, though the journey cost the lives of many in their party.
His legacy is also marked by controversy and shifting alliances. In 1579, Tadatsugu confirmed suspicions to Oda Nobunaga regarding Lady Tsukiyama's alleged betrayal, leading to her execution and the forced seppuku of Ieyasu's son, Matsudaira Nobuyasu. Some historians, such as Arthur Lindsay Sadler, have theorized this was an act of personal spite. Despite such dark chapters, Tadatsugu remained a central figure until his retirement following the 1590 Odawara Campaign. He died in Kyoto in 1596, leaving behind a family that would continue to prosper and hold significant domains for centuries, eventually reaching the status of Count during the Meiji period.
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