The first historical evidence of the municipal center Toshevo dating from 1573 to the Turkish tax register dzhelepkeshanite which was mentioned by name, which carries up to 1942 - Kasim. The village's name is written "with Haji Kasim Semiz Enbiyalar" and the names of the eight shepherds, 340 sheep due to the state . Four of these shepherds have Kasim family that has reason to believe that the first of them who settled in these lands was given the name of the village. In documents from mentioning names of the other three men in the family and Kasim are sons Semiz-Suleiman and Kasim Semiz Musa Semiz Torsun Kasim and his brother. The document from 1573 mentions the name of Hadji Enbiyalar, but it has no stored sources. In 1673 the Turkish village was registered as zapisanosamo Kasim, and in 1676 was changed to Semiz Kasim. Existence some controversy about the name of the village Velikovo , also referred to as Semiz Kasim and as Kasamdzha, Kasim give.
There are several suggestions as to what "Semiz Kasim." Semiz comes from Turkish and means fat, fat, food. Kasim (also Kasim) except that it has its own name and a few more important as a divider that separates November 8, ie early winter (holiday Demetrius ) and more like a handful, ie a small village. But this name can also be interpreted that first settled here Kasim was full, fat, fatty, so called Semiz Kasim.
At the end of the 19th century in the village established a small colony on the Dobrudja Germans .
During the Romanian occupation of South Dobrogea Romanian authorities for the settlement proclaim the regional center of Saint Demetrius district and village official name of St. Demetrius (Romanian: Stantul Dumitru) in 1926 In 1934, the village name was changed again and again is a Romanian name - Ion Gheorghe Duca. Is named after the Romanian bourgeois politician, leader of the National Liberal Prime Minister of Romania . He was murdered on 29.12.1933 on a platform in a train station in the
