Alexander Jagiellon
The strong economic development of the area continued during the reign of Casimir's son - Duke Alexander Jagiellon who founded the first solid bridge over the Neman River as well as Monastery of Order of Saint Augustine and Monastery of Polish "Ordo Fratrum Minorum". Later, Bona Sforza Queen of Poland and Grand Duchess of Lithuania, placed in Grodno her royal residence. According to medieval surveys, Grodno had 35 streets and 700 houses in 1558.