Despite calamities triggered by the Great Fire of 1547, the early part of Ivan's reign was one of peaceful reforms and modernization. Ivan revised the law code, creating the Sudebnik of 1550, founded a standing army (the streltsy), established the Zemsky Sobor (the first Russian parliament of the feudal Estates type) and the council of the nobles (known as the Chosen Council), and confirmed the position of the Church with the Council of the Hundred Chapters (Stoglavy Synod), which unified the rituals and ecclesiastical regulations of the whole country. He introduced local self-government to rural regions, mainly in the northeast of Russia, populated by the state peasantry.  By Ivan's order in 1553 the Moscow Print Yard was established and the first printing press was introduced to Russia. Several religious books in Russian were printed during the 1550s and 1560s. The new technology provoked discontent among traditional scribes, leading to the Print Yard being burned in an arson attack. The first Russian printers, Ivan Fedorov and Pyotr Mstislavets, were forced to flee from Moscow to the Grand Duchy of Lithuania. Nevertheless, printing of books resumed from 1568 onwards, with Andronik Timofeevich Nevezha and his son Ivan now heading the Print Yard.  Ivan had St. Basil's Cathedral constructed in Moscow to commemorate the seizure of Kazan. There is a false legend that he was so impressed with the structure that he had the architect, Postnik Yakovlev, blinded so that he could never design anything as beautiful again. In reality, Postnik Yakovlev went on to design more churches for Ivan and the walls of the Kazan Kremlin in the early 1560s, as well as the chapel over St. Basil's grave that was added to St. Basil's Cathedral in 1588, several years after Ivan's death. Although more than one architect was associated with this name and constructions, it is believed that the principal architect is one and the same person.  Other events of this period include the introduction of the first laws restricting the mobility of the peasants, which would eventually lead to serfdom, instituted during the rule of future tsar Boris Godunov in 1597. (See also Serfdom in Russia.)

Answer this question "what else did he do during his reign?" by extracting the answer from the text above.
Other events of this period include the introduction of the first laws restricting the mobility of the peasants,