Festival: Theadelpheia in Alexandria (Egypt)
| Festival ID: | 1486 |
| Festival Name: | Theadelpheia |
| Festival Place: | Alexandria (Egypt) |
| Comment: | Established in mid 3rd century BC - earliest secure attestation 243/2. Continues through to at least 2nd century BC. Held concurrently with Ptolemaia. Dedicated to the Theoi Adelphoi, Ptolemy II and Arsinoe II. Penteteric. |