The long reign of King Christian IV (1577-1648) was a turbulent period. At the start of his rule Denmark, forming a unity with Norway, enjoyed great prosperity. By the end his irrepressible urge for military expansion left his people impoverished.
In the early seventeenth century Denmark was recognised as the dominant Baltic power, but by the end of his reign this role was gradually taken over by Sweden. During the Thirty-Year War Denmark had to surrender part of Norway to Sweden and was reduced to a second-rate power. In the mid-seventeenth century Sweden’s era was just beginning. The first decade of Christian’s rule was marked by a flurry of palace construction. Between 1596-1600 the king had tennis courts erected at five of his favourite castles: Kronborg, Koldinghus, Frederiksborg, Copenhagen and Skanderborg. Two buildings are still recognisable as former tennis courts: the Teahouse at Frederiksborg Castle and the library at Soro Academy.
The tennis court can be seen in Pa Resens’s Atlas Danicus of 1677. The building appears to be the only seventeenth century tennis court that has survived. The original boldhus now serves as the Soro Academy’s Library (see photo). The building has retained the characteristic rectangular shape of a tennis court (measurements c. 32 x 11 metres, 51 x 17.5 alen). Soro Academy employed a keeper of the tennis court (boldmester) for an annual salary of 60 Rdl.