Union Jack
national flag of the United Kingdom (UK)
The Union Jack or Union Flag is the national flag of the United Kingdom. While no law has been enacted making the Union Flag the national flag of the United Kingdom, it has become so through precedent.
The flag overlays three crosses, each representing a constituent country of the United Kingdom. England is represented by the red cross of Saint George edged in white, Scotland is represented by the white saltire of Saint Andrew on a blue field, and Northern Ireland is represented by the red saltire of Saint Patrick edged in white. The remaining constituent country, Wales, is not represented in the flag because the earlier flag of Great Britain was designed while Wales was part of the Kingdom of England.
The origins of the flag date to the earlier flag of Great Britain which was established in 1606 by a proclamation of King James VI and I of Scotland and England. The present design was established by an order in council following the Act of Union 1800, which joined the Kingdom of Great Britain and the Kingdom of Ireland to create the United Kingdom of Great Britain and Ireland. It was unchanged following the secession of the Irish Free State in 1922.
The flags of British Overseas Territories, as well as certain sovereign states and regions (particularly in the Commonwealth) that were previously British possessions, incorporate the Union Jack into their own flag designs or have official flags that are derived from the Union Jack. Many of these flags are blue or red ensigns with the Union Jack in the canton and defaced with the distinguishing arms of the territory.
Begin with the source’s own compact description: “Union Jack” is national flag of the United Kingdom (UK). The dossier treats that line as a proposition to test through Union, Jack and national, not as a finished interpretation.
Why this record matters
The phrase “national flag of the United Kingdom (UK)” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 21, 2026. The linked authority identifier is Q83278. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1606, 1800 and 1922.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Union Jack” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.