Palmanova is a town in northeastern Italy and an excellent example of star fort of the Late Renaissance, built up by the Venetians in 1593.
Palmanova was built following the ideals of a utopia. It is a concentric city with the form of a star, with three nine-sided ring roads intersecting in the main military radiating streets. It was built at the end of the 16th century by the Venetian Republic which was, at the time, a major center of trade. It is actually considered to be a fort, or citadel, because the military architect Giulio Savorgnan designed it to be a Venetian military station on the eastern frontier as protection from the Ottoman Empire.
Between the points of the star, ramparts protruded so that the points could defend each other. A moat surrounded the town, and three large, guarded gates allowed entry. The construction of the first circle, with a total circumference of 7 kilometres, took 30 years.
References:The Basilica of Santa Maria in Trastevere is one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140-43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I.
The inscription on the episcopal throne states that this is the first church in Rome dedicated to Mary, mother of Jesus, although some claim that privilege belongs to the Basilica di Santa Maria Maggiore. A Christian house-church was founded here about 220 by Pope Saint Callixtus I (217-222) on the site of the Taberna meritoria, a refuge for retired soldiers. The area was made available for Christian use by Emperor Alexander Severus when he settled a dispute between the Christians and tavern-keepers.
The church underwent two restorations in the fifth and eighth centuries and in 1140-43 it was re-erected on its old foundations under Pope Innocent II.