The flag of the county of Rogaland, Norway. Its design is shared with the county arms, and depicts a heraldic abstraction of a stone cross, now in the Stavanger Museum, commemorating Erling Skjalgsson (d. 1028). The point at the cross’s foot enabled it to be staked into the ground or affixed to a processional staff. The flag was approved by royal resolution 1974‐01‐11.
Rogaland fylke, flagg – Arkivverkets digitale fotoarkivForskrift om godkjennelse av fylkesvåpen og fylkesflagg, Rogaland – Lovdata
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(Sources of the oldest file version:)

Based on File:..Rogaland Flag(NORWAY).png and File:Rogaland våpen.svg
Hallvard Trætteberg, vectorization by VulpesVulpes42
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(Authorship information for the oldest file version:)

PNG flag by AlexR.L. (CC-BY-SA 3.0)Coat of arms by SKvalen (PD-Norwegian CoA)SVG flag by SiBr4