Question: What is the date of death of Count Primo Magri's wife?
Sentence (from "Count Primo Magri"): Count Primo Magri (1849–1920) and Count Rosebud were the stage names of a 19th-century Italian dwarf who married Lavinia Warren, the widow of General Tom Thumb on Easter Monday, April 6, 1885 at the Church of the Holy Trinity in New York City.
Relevant evidence: Yes