The House of Demidov also Demidoff and Dimidov, was a prominent Russian noble family during the 18th and 19th centuries. Originating in the city of Tula in the 17th century, the Demidovs found success through metal products, and were entered into the European nobility by Peter the Great. Their descendants became among the most influential merchants and earliest industrialists in the Russian Empire, and at their peak were predicted to be the second-richest family in Russia, behind only the Russian Imperial Family whose net worth was around $300 billion. The Demidov family scattered to America, Italy, and other European countries as a result of the February Revolution of 1917.

Tula is the largest city and the administrative center of Tula Oblast in Russia, located 193 kilometers (120 mi) south of Moscow. Tula is located in the northern Central Russian Upland on the banks of the Upa River, a tributary of the Oka. At the 2010 census, Tula had a population of 501,169, an increase from 481,216 in 2002, making it the 32nd-largest city in Russia by population.