Richardis
Holy Roman Empress from 881 to 888, Catholic saint
Feast: 18 September (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Who they were
Saint Richardis (Latin: Richgardis, Richardis), also known as Richgard, Richardis of Swabia and Richarde de Souabe in French (c. 840 – 18 September, between 894 and 896 AD), was empress of the Carolingian Empire as the wife of Charles the Fat. She was renowned for her piety and was the first abbess of Andlau. Repudiated by her husband, Richardis later became a Christian model of devotion and just rule. She was canonised in 1049.
Summary from Wikipedia (CC BY-SA 4.0), until this page is written up in full.
The miracles
Limited information available on this saint.
Why that counted as sanctity
Limited information available on this saint.