As with his brother before him, Charles IV died without a male heir, thus ending the direct line of the House of Capet. Twelve years earlier, a rule against succession by females, arguably derived from the Salic law, had been recognized as controlling succession to the French throne. Application of this rule barred Charles' 1-year-old daughter Mary from succeeding as the monarch.
Jeanne was also pregnant at the time of his death. Since it could have been possible that she would give birth to a son, a regency was set up with the heir presumptive Philip of Valois, a member of the House of Valois (the next-most-senior branch of the Capetian dynasty), being the regent. After two months, Jeanne gave birth to Blanche. The regent thus became the King and in May was consecrated and crowned Philip VI. At this time, a further rule of succession, again arguably based on the Salic law, was recognized as forbidding not only inheritance by a woman, but also inheritance through a female line.