The Basilica of Constantine (German: Konstantinbasilika), or Aula Palatina, is a Roman palace basilica
that was built by the emperor Constantine (AD 306–337) at the beginning of the 4th century.

Today it is owned and used as church by a congregation within the Evangelical Church in the Rhineland.
The basilica contains the largest extant hall from antiquity and is ranked a World Heritage Site.
The hall has a length of 67 m, a width of 26.05 m[1] and a height of 33 m.