Page 43 "...old Mr. Piso, begun in Bari, Italy..."

From page 43 of the book:  "...Her wretched marriage, to the man who was Sylvester's father, was a godsend to her parents and helped to end the blood feud between old Mr. Sarjevo and old Mr. Piso, begun in Bari, Italy, around the time of the outbreak of the First World War. (Old Mr. Piso had coveted and stolen old Mr. Sarjevo’s sweetheart: He’d reported him to the local conscription authorities, who’d needed men to fight the encroaching Austrians; one man went off to the Italian alps to dodge exploding shells and the other (old Mr. Piso) stayed behind as reward for more than one informative betrayal of the neighborhood’s single and eligible men."