Marchiori was born in Lendinara, Province of Rovigo.[1] He studied mathematics at the University of Padua, and came late to painting. He was also active as a parliamentarian (1878–1880), and was a dilettante poet.[2] He studied in Rome at the Accademia del Nudo.
In 1881 at Milan, he exhibited a canvas depicting a Priest of the Ancient Bacchus. In 1884 at Turin, he displayed a portrait in watercolor. In 1887 at Venice, he exhibited a watercolor titled Dal triclinio al cubicolo, and a canvas titled Aspettilo anca ti.[3]
He also painted frescoes for the Palazzo Marchiori in Lendinara, portraits, and an altarpiece for the church in Cavazzana, Rovigo.[4]