The most significant period for the town is the time from 1561 to 1795, when the Jelgava district is a part of the Duchy of Courland and Zemgale. When Jelgava obtains the status of residence of the Duke of (1567t) and becomes the capital of the Duchy (1616) a rapid urban development begins, which is highest of during the reign of Duke Jacob. During the reign of last two Dukes of Courland - Ernst Johann Biron and his son Peter (1775) St. Peter's Academy (Academia Petrina) - the first Latvian Institute is founded, in 1816 is founded Courland Society of Literature and Art, in 1822 the first newspaper in Latvian "The Latvian newspaper" is published, in 1802 the first Latvian theatre building is built, but in 1898- the first building intended for museum. In 1937 Latvian agriculture camera is located in the Jelgava palace, but after two years Jelgava Agriculture Academy is opened. Nearly all the town's historic buildings and art treasures perished in the summer of 1944. After the World War II, Jelgava was rebuilt. Recently the Trinity Church tower has been restored, in which now is located one of the best Latvian interactive museums (very friendly for families with children).