Gauri Mahadevi was the

queen regnant A queen regnant (plural: queens regnant) is a female monarch, equivalent in rank and title to a king, who reigns ''suo jure'' (in her own right) over a realm known as a "kingdom"; as opposed to a queen consort, who is the wife of a reignin ...

of the Indian

Bhauma-Kara dynasty The Bhauma dynasty, also known as Kara dynasty, ruled in eastern India between 8th and 10th centuries. Their kingdom, called Toshala (IAST: Toṣala), included parts of present-day Odisha. By the last quarter of the 8th century, the Bhauma-Karas ...

's Kingdom of Toshala in c. 910-916. It is possible that she was in fact regent during the minority of her daughter queen Dandi Mahadevi, rather than a monarch in her own right. She was married to Subhakaradeva V. She succeeded her late spouse on the throne when he died. Not much is known about her reign. However, she is described as a successful ruler, who managed to maintain law and order within the kingdom. The Kumurang plate of Dandi Mahadevi stated that: :“….. at her lotus-like feet was prostrate the entire population (of the kingdom)”.Archana Garodia Gupta,
The Women Who Ruled India: Leaders. Warriors. Icons.
' In 916, she was succeeded by her daughter Dandi Mahadevi.

References

* Archana Garodia Gupta,
The Women Who Ruled India: Leaders. Warriors. Icons.
' 10th-century queens regnant 10th-century Indian monarchs 10th-century Indian women 10th-century women regents 10th-century regents