This grave, located in Abwa, close to Madinah is of Bibi Aminah (رضي الله عنها), the mother of the Prophet (ﷺ). She passed away returning from Madinah to Makkah when the Prophet (ﷺ) was just six years old.
Video below by Sheik Tariq Jameel describing the death of the Prophet’s mother:
Note that this entry has been shown for information purposes only. On no account should anybody pray to a grave or seek supplication through them as this is tantamount to committing shirk, associating partners with Allah (ﷻ)