One manuscript of the Crónica de Sampiro records that “Rex Sancius” married “Tarasiam” by whom he had “filium…Ranimirum”. The Crónica de Sampiro, as reproduced in the Historia Silense, records that "filius eius Ramirus…annos quinque" succeeded on the death of King Sancho I in "era MV", under the regency of "amite sue domne Geluire".
He succeeded his father in 966 as RAMIRO III King of León, under the regency of his aunt Elvira Ramírez. “Giluira…prolis…regis…cum suprino meo…principe domno Ranemiro, soboli…Sanctionis” donated property to Celanova by charter dated 1 Jan 968, confirmed by “…Veremudus…princeps, prolis Ordonii regis…”. “Ranemirus...rex...cum amita et nutrice mea Geloira deodicata...et genitrice Tarasia deouota” donated “de comitatu de Mera III, de Nallare IV...et Parriga media et IV de comitato Nemitos” to Sobrado by charter dated 17 Sep 968. "Ranimiro rex et Gelbira reina domna" donated property to the monastery of Sahagún by charter dated 11 May 971. The kingdom of León was further weakened during his reign, with a drastic contraction of its frontiers as a result of Muslim advances. His rule was challenged by his cousin Vermudo, later King Vermudo II, which resulted in a bitter civil war in León lasting from 982 to 985. He is referred to as "Ranimirus flavius princeps magnus basileus" in a donation to the monastery of Sahagún dated 1 May 974, although it is doubtful whether King Ramiro used such pretentious titles indicating that the document is probably spurious. “Ranemirus rex...cum genitrice mea Tarasia regina et Christi ancilla” confirmed the donation of “Parriga media...Mera media, quarta in Nallare, quarta in Nemitos, media Marzola, Vendurio medio” to Sobrado by charter dated 18 Jul 978.
The Crónica de Sampiro, as reproduced in the Historia Silense, records that King Ramiro died at León after reigning for sixteen years. The Chronicon Compostellani records that “Ranemirus filius eius [Sancii]” reigned 15 years. 1
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