Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by form]
8. [single built works by form: massing or shape]
9. apsidal buildings

Anotations

Scope note:

Buildings, usually churches, mausoleums, or baptistries, having a cross plan with four apses. Usually the arms of the cross form a Greek cross plan, with arms of equal length. The design was common in Byzantine architecture.