Rhun ab Arthgal

Gelar Rhun seperti yang muncul pada folio 29r Paris Bibliothèque Nationale Latin 4126 (naskah Poppleton): "regis Britannorum" ("raja Briton").

Rhun ab Arthgal merupakan Raja Strathclyde abad ke-9. Ia adalah satu-satunya putra Arthgal ap Dyfnwal yang diketahui, Raja Alt Clut. Pada 870, selama masa pemerintahan yang terakhir, benteng Dùn Breatainn ditangkap oleh Viking, setelah itu Arthgal dan keluarganya mungkin termasuk di antara banyak tahanan yang dibawa kembali ke Irlandia. Dua tahun kemudian Arthgal tercatat telah terbunuh atas perintah Causantín mac Cináeda. Fakta bahwa Rhun tampaknya adalah saudara ipar Causantín dapat menjelaskan campur tangan Causantín dalam kerajaan Alt Clut.

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