Caernarfonshire
| Flag Type | County Flag |
| Flag Date | c.17th Century |
| Designer | Unknown |
| Adoption Route | Traditional |
| UK Design Code | . |
| Aspect Ratio | 3:5 |
| Pantone Colours | Green 354, Yellow 109 |
| Certification | Flag Institute Chief Vexillologist, Graham Bartram |
Notes
This is a banner of the arms attributed to Owain Gwynedd whose kingdom covered most of the present day county, the eagles represent the legendary ones of Snowdonia whose welsh name of Eryri means 'nest of Eagles'. This design was used a lot by local aristocracy in the middle ages and was mentioned by the seventeenth century poet and historian Michael Drayton as the banner borne by the men of Caernarfonshire at Agincourt. The county's long association with the three eagles was maintained in the design of the seal and arms borne by the later county council and can still be seen in the emblems of a number of local organisations. The design was called an "authentic" and "significant" badge for the county in Frederick Hackwood's 'Story of the Shire'. The full history the design can be found here: [1]