In the late 15th century, after the beginning of the Renaissance, two other roads leading to Saint Peter from Ponte Sant'Angelo were built: Borgo Sant'Angelo, also known as "via Sistina" after Pope Sixtus IV (r. 1471-84), running just south of the Passetto (the covered passage linking Vatican with the Castle), and Borgo Nuovo, also known as "Via Alessandrina", after Pope Alexander VI Borgia (r. 1492-1503), who erected it.