Medhātithi is one of the oldest and most famous commentators on the Manusmṛti, more commonly known as the Laws of Manu.
The Manusmṛti text is a part of the Hindu Dharmaśāstra tradition, which attempts to record the laws of dharma.
There is some debate over the exact location in which Medhātithi composed his commentary, but there is significant evidence which places him in Kashmir.
[1] Robert Lingat does not acknowledge a debate about Medhātithi's origin, stating explicitly "one knows nothing about him save that he lived in Kashmir.
[4] David Brick, in his 2010 review of historical literature on widow burning, places him about 1000 CE.