was the first city ever ruled by any dynasty?
Kingdom of Italy
Rijeka
With the 1924 Treaty of Rome between the Kingdom of Italy and the Kingdom of Yugoslavia, the two countries agreed to annex and split the territory of the Free State of Fiume between themselves. 
what is european route e751 ? It isdefined by the Declaration on the Construction of Main International Traffic Arteries of 1975. where is it located? Rijeka, Croatia can you please describe the route? It consists of motorways, but considerable sections are either expressways or two-lane roads with at-grade intersections. can you name any person or organization who helped in its development? UNANSWERABLE what places does the route connect? It connects Croatian and Slovenian Adriatic coastal areas in the vicinity of the city of Rijeka, Istria and Slovenian Littoral.
wiki:12139501
Rijeka [SEP] The territory of Fiume part of the Kingdom of Italy
With the 1924 Treaty of Rome between the Kingdom of Italy and the Kingdom of Yugoslavia, the two countries agreed to annex and split the territory of the Free State of Fiume between themselves. The formal annexation (16 March 1924) inaugurated 19 years of Italian fascist rule and the city became the seat of the newly formed Province of Carnaro. In this period Fiume lost its commercial hinterland and thus part of its economic potential, due to it becoming a border town with little strategic importance for the Kingdom of Italy. But thanks to it retaining the Free Port status, and its iconic image in the fascist nation-building myth it gained many specific concessions from the government in Rome, a separate tax treatment from the rest of the Kingdom and a more humble than in Hungarian times, but continuous inflow of investments from the state.