While serfdom was retained under Swedish rule, legal reforms took place which strengthened peasants' land usage and inheritance rights, resulting this period's reputation of the "Good Old Swedish Time" in people's historical memory. Swedish king Gustaf II Adolf established gymnasiums in Reval and Dorpat; the latter was upgraded to Tartu University in 1632. Printing presses were also established in both towns. In the 1680s the beginnings of Estonian elementary education appeared, largely due to efforts of Bengt Gottfried Forselius, who also introduced orthographical reforms to written Estonian. The population of Estonia grew rapidly for a 60–70-year period, until the Great Famine of 1695–97 in which some 70,000–75,000 people died – about 20% of the population.