Reginald I may refer to:
*
Reginald I, Count of Burgundy
Reginald I was the second count of the Free County of Burgundy. Born in 986, he was the son of Otto-William, the first count, and Ermentrude de Roucy.
In 1016, Reginald married Alice of Normandy. He succeeded to the county on his father's deat ...
(968–1057), Count of the Free County of Burgundy from 1026
*
Reginald I, Count of Bar
Reginald I (also called "the One-eyed", Reinald I, Renaud I; – 10 March 1149) was Count of Bar (1105–1149). Barrois, during the Middle Ages, was the territory of the counts and dukes of Bar, in the eastern part of present-day France, bo ...
(died 1149), called "the One-eyed", Count of Bar from 1105
*
Reginald I of Guelders
Reginald I of Guelders (1255 – October 9, 1326 in Monfort) was Count of Guelders from January 10, 1271 until his death. He was the son of Otto II, Count of Guelders and Philippe of Dammartin.
In 1276 he married Irmgard of Limburg, only daught ...
(1255–1326), Count of Guelders from 1271
*
Rögnvaldr Óláfsson (fl. 1164) Ragnvald Olafsson or Rǫgnvaldr Óláfsson may refer to:
*Ragnvald Heidumhære (fl. 9th century), possibly son of Olaf Geirstad-Alf, petty king of Vestfold
* Rǫgnvaldr Óláfsson (fl. 1164), king of Mann and the Isles
*Rǫgnvaldr Óláfsson (died ...
(
fl.
''Floruit'' (; abbreviated fl. or occasionally flor.; from Latin for "they flourished") denotes a date or period during which a person was known to have been alive or active. In English, the unabbreviated word may also be used as a noun indicatin ...
1164), referred to in some texts as Reginald, ruler of the Isle of Man for a brief period in 1164
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