By the end of the decade however, the Austrian Navy began to be rebuilt. The growth of the Austrian Navy in the years following the Congress of Vienna were largely driven by political necessities, as well economic conditions. The marriage between Archduchess Maria Leopoldina and Emperor Pedro I of Brazil in 1817 marked the first time a ship from the Austrian Navy crossed the Atlantic Ocean to the Americas, with the Archduchess traveling with the frigates "Augusta" and "Austria" to Rio de Janeiro. Three years later, the frigate "Carolina" escorted Austria's ambassador to Brazil across the Atlantic, before sailing on to China, marking the first time a ship from the Austrian Navy had traveled to East Asia. During the 1820s and early 1830s, Austrian trade along the Danube and within the Mediterranean grew rapidly. In 1830, the Austrian Danube Steam Navigation Company was founded and in 1834, its steamship "Marie Dorothee" became the first of its kind to travel the Mediterranean on a voyage between Trieste and Constantinople. In 1836, the Austrian Lloyd (German: "Österreichischer Lloyd") was established. While Austria's merchant marine grew throughout the 1820s and 1830s, the Austrian Navy grew alongside it in order to provide protection on the high seas.