It is estimated that the year of his birth was 1575, but around this time, his real mother, Takehime was a lawful wife of Tadamasa SAKURAI MATSUDAIRA (the real elder brother of his father, Tadayoshi).
なお、生年については天正3年（1575年）説もあるが、同年当時に生母・多劫姫は桜井松平忠正（父・忠吉の実兄）の正室であった時期にあたる。