According to Mullin, despite living through such violent times Kelzang Gyatso was perhaps 'the most spiritually learned and accomplished of any Dalai Lama', his written works comprising several hundred titles including 'some of Tibet's finest spiritual literary achievements'. In addition, despite his apparent lack of zeal in politics, Kelzang Gyatso is credited with establishing in 1751 the reformed government of Tibet headed by the Dalai Lama, which continued over 200 years until the 1950s, and then in exile. Construction of the Norbulingka, the 'Summer Palace' of the Dalai Lamas in Lhasa was also started during Kelzang Gyatso's reign.