Archduke Charles was reared a devout Catholic. He spent his early years wherever his father's regiment happened to be stationed; later on, he lived in Vienna and Reichenau an der Rax. He was privately educated, but, contrary to the custom ruling in the imperial family, he attended a public gymnasium for the sake of demonstrations in scientific subjects. On the conclusion of his studies at the gymnasium, he entered the army, spending the years from 1906-08 as an officer chiefly in Prague, where he studied Law and Political Science concurrently with his military duties. In 1907, he was declared of age, and Prince Zdenko Lobkowitz was appointed as his chamberlain. During the next few years, he carried out his military duties in various Bohemian garrison towns. Charles' relations with his great-uncle were not intimate, and those with his uncle Franz Ferdinand were not cordial, with the differences between their wives increasing the existing tension between them. For these reasons, Charles, up to the time of the assassination of his uncle in 1914, obtained no insight into affairs of state, but led the life of a prince not destined for a high political position. In 1911, Charles married Princess Zita of Bourbon-Parma. They had met as children but did not see one another for almost ten years, as each pursued their education. In 1909, his Dragoon regiment was stationed at Brandýs nad Labem in Bohemia, from where he visited his aunt at Franzensbad. It was during one of these visits that Charles and Zita became reacquainted. Due to Franz Ferdinand's morganatic marriage in 1900, his children were excluded from the succession. As a result, the Emperor pressured Charles to marry. Zita not only shared Charles' devout Catholicism, but also an impeccable royal lineage. Zita later recalled:  Archduke Charles traveled to Villa Pianore, the Italian winter residence of Zita's parents, and asked for her hand; on 13 June 1911, their engagement was announced at the Austrian court. Charles and Zita were married at the Bourbon-Parma castle of Schwarzau in Austria on 21 October 1911. Charles's great-uncle, the 81-year-old Emperor Franz Joseph, attended the wedding. He was relieved to see an heir make a suitable marriage, and was in good spirits, even leading the toast at the wedding breakfast. Archduchess Zita soon conceived a son, and Otto was born 20 November 1912.