As director of the Il Lavoratore from Trieste, he came in Fiume to give “organisational support” from the Communist Party of Italy in building the Communist Party of Fiume, where he died in his sleep of gas intoxication on November 15, 1921.
The site of the battle, Tharsatica or Tarsatica in Latin, has been traditionally identified as Trsat, a hill fort whose ruins today overlook the city of Rijeka (Fiume).
In fact already in 1776, when it was decreed to include Fiume to Hungary through Croatia, it was the count József Majláth, acting as Hungarian royal commissar, who took over the town from baron Pasquale Ricci, the representative of the Intendancy from Trieste.
One of its first editors was Cesare Seassaro from Pavia, who died in Fiume on 15 November 1921, where he came to give "organisational support" from the Communist Party of Italy in building the Communist Party of Fiume.
He was not related to Samuel Maylender, a physician and socialist leader in Fiume, who later joined the Communist Party of Fiume in 1921.
Host-Venturi become secretary of the Fascist Federation of Fiume from November 15, 1925 to 24 May 1928, and was a special commissioner to Pola from 1 April to May 24, 1926.
Fiume Santo, a 1,040 MW power station owned by E.ON, is a 5–10 km west from the port, in the municipality of Sassari.