In the presbytery area stands the beautiful triumphal arch.
A rich blue stucco festoon hangs from it, with golden stars supported by angels.
In the upper part of the arch we can see the coats of arms of the card. FM Orsini with the coat of arms of the Dominicans, of Bishop Cennini and of the Cathedral Chapter.
Behind the altar there is a beautiful wooden choir in Gothic style from the 1500s, commissioned by Bishop Manzolio.
The organ above main altar was presented to the public on 28 September 1907.

The Cathedral of Santa Maria Assunta – built by the Normans in 11th-12th centuries - is one of the most important monuments of Gravina.
Destroyed by fires and earthquakes in the mid-15th century, it was refurbished in Renessaince - Romanesque style.
It houses a splendid reliquary of an arm of the English saint Thomas Becket (1119-1170).
In August 1993 Pope John Paul II granted Gravina Cathedral the status of a minor basilica.