Landlocked Umbria's rich green countryside surrounds a golden triangle of historic cities, the Assisi of St. Francis, the noble university hillside town of Perugia, and the medieval mountain post of Gubbio.
Gubbio was a key military stronghold.
mnli hypothesis: Gubbio was a key military stronghold. premise: Landlocked Umbria's rich green countryside surrounds a golden triangle of historic cities, the Assisi of St. Francis, the noble university hillside town of Perugia, and the medieval mountain post of Gubbio.