In 1859, Owen J. Goldrick established the Union School, Denver's first school, a private school that served thirteen students. Other private schools opened shortly thereafter to accommodate Denver's rapidly growing population during the Pike's Peak Gold Rush. In 1861, the new territorial government established Goldrick as the superintendent in Arapahoe County (which then encompassed Denver). Soon after the first two public school districts in Denver were formed: District One on the east side of the city and District Two on the west side. District Two opened the first public school in Denver on December 1, 1862 in a rented log cabin and District One followed suit soon after. On April 2, 1873 the first purpose built school building, the "Arapahoe School", opened.