Succession to the Russian throne
The Russian monarchy was abolished in 1917. Before its abolition, te Russian Empire followed agnatic-cognatic primogeniture aka semi-Salic law as a succession law.
According to agnatic-cognatic primogeniture, all male dynasts (males born to dynastic marriage) of the imperial house of Romanov are in the line of succession in an order of primogeniture. Only if there are no male dynasts avalailable, a woman is allowed to take the throne.