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Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link

The University Church of St Mary the Virgin is situated on the north side of the High Street. It is the centre from which the University of Oxford grew and its parish consists almost exclusively of university and college buildings.

St Mary's possesses an eccentric baroque porch, designed by Nicholas Stone, facing the High Street, and a spire. Radcliffe Square lies to the north ,and to the east is Catte Street. The 13th-century tower is open to the public and provides good views across the heart of the historic university city, especially Radcliffe Square, the Radcliffe Camera, Brasenose College and All Souls' College.

St Mary's is Grade I listed. Link .

Wikipedia: Link