of Sweden. In the 1540s, first King Gustav Vasa, and later his sons Erik XIV of Sweden and John III of Sweden would organize a rebuilding of the castle into the magnificent Renaissance castle it is today. Kalmar became a diocese in 1603, a position it held until 1915. In 1634, Kalmar County was founded, with Kalmar as the natural capital. In 1660, the Kalmar Cathedral was begun by drawings of Nicodemus Tessin the Elder. It would be inaugurated in 1703. In 1611–1613, it suffered in the Kalmar War, which began with a Danish siege of Kalmar Castle. 1611 is mentioned as the darkest year of Kalmar's history, but by no means the only dark year; much blood has been shed in the vicinity of the castle. The last was during the Scanian War in the 1670s, so there have been 22 sieges altogether; however the castle was never taken. After the Treaty of Roskilde in 1658, the strategic importance of Kalmar gradually diminished as the borders were redrawn further south. In 1689, the King established his main naval base further south in Karlskrona and Kalmar lost its status as one of Sweden's main military outposts. Kalmar Cathedral The new city of Kalmar was built on Kvarnholmen around the mid-1600s. The transfer from the old town was largely completed by 1658. The new, fortified town was planned following current baroque patterns. Cathedral and town hall face each other across the new main square, Stortorget. The cathedral was designed by Nicodemus Tessin the Elder and is one of the foremost examples of baroque classicism in Sweden. Its design reflects the complex interaction between the new style, liturgical considerations, tradition and the fortress-city requirements. The work began in 1660, but it was interrupted on several occasions, including when the Scanian War (1675–1679) raged. Construction resumed, and Kalmar Cathedral stood finished in 1703. Today In more recent times, Kalmar has been an industrial city with Kalmar Verkstad making steam engines, trains and large machinery, later bought by Bombardier who closed the factory in 2005. A shipyard, Kalmar Varv, was founded in 1679 and closed 1981. Volvo opened their Kalmar factory for building cars i.e. 264, 740, 760, 960 in 1974, but closed it 1994 and due to further relocation of industry jobs in the 1990s and 2000s around 2000 industrial jobs were lost. Kalmar has a university with over 9,000 students and a