But one of the regents was Ieyasu Tokugawa, who had been biding his time at Edo for 12 years, nurturing dynastic ambitions of his own.
Ieyasu Tokugawa successfully founded his own dynasty.
mnli hypothesis: Ieyasu Tokugawa successfully founded his own dynasty. premise: But one of the regents was Ieyasu Tokugawa, who had been biding his time at Edo for 12 years, nurturing dynastic ambitions of his own.