1911 Encyclopædia Britannica, Volume 28… (1911)
“ On the 7th of February 1901 Queen Wilhelmina married Henry Wladimir Albert Ernst, duke of Mecklenburg-Schwerin (born on the 19th of April 1876) . To the great joy of the Dutch people. Queen Wilhelmina, on the 30th of April 1909, gave birth to an heir to the throne, the Princess Juliana (Juliana Louise Emma Maria Wilhelmina) . ”
