Editing Pope Nicholas V (section)

===Rebuilding Rome===
His first care was practical, to reinforce the city's fortifications,{{sfnp|Cheetham|1983|p=180}} cleaning and even paving some main streets and restoring the water supply. The end of ancient Rome is sometimes dated from the destruction of its magnificent array of [[Roman aqueduct|aqueducts]] by 6th-century invaders. In the [[Middle Ages]] Romans depended on wells and cisterns for water, and the poor dipped their water from the yellow [[Tiber]]. The [[Aqua Virgo]] [[aqueduct (watercourse)|aqueduct]], originally constructed by [[Marcus Vipsanius Agrippa|Agrippa]], was restored by Nicholas and emptied into a simple basin that Alberti designed, the predecessor of the [[Trevi Fountain]].<ref>{{cite journal |url=http://www3.iath.virginia.edu/waters/Journal3KarmonNew.pdf|pages=4–6 |first=David |last=Karmon |journal=The Waters of Rome |issue=3 |date=August 2005 |publisher=[[University of Virginia]] |title=Restoring the Ancient Water Supply System in Renaissance Rome}}</ref>

He continued restoration of the major Roman basilicas, but also of many other Roman churches including [[Santi Apostoli, Rome|Sant' Apostoli]], [[Sant'Eusebio|Sant' Eusebio]], [[San Lorenzo fuori le Mura]], [[Santa Maria in Trastevere]], [[Santa Prassede]], [[San Salvatore in Onda|San Salvatore]], [[Santo Stefano al Monte Celio|Santo Stefano Rotondo]], [[San Teodoro, Rome|San Teodoro]], and especially [[Santi Celso e Giuliano|San Celso]].{{sfnp|Hollingsworth|1995|p=240}} He rebuilt the [[Ponte Sant' Angelo]] which had collapsed in 1450, and supported the redevelopment of the surrounding area as a prestigious business and residential district.{{sfnp|Hollingsworth|1995|p=241}}