Herleva of Falaise was a Norman woman who was the mother of William by his father, Duke of Normandy Robert I. Orderic Vitalis writing a generation or two later said that her father was Fulbert, Robert's chamberlain. William of Malmesbury wrote that Herleva and Robert were later married, but if that had actually happened in William's lifetime then he would have been legitimized and not called Bastard.
Supposedly Robert was high atop one of his towers when he looked down and saw Herleva. She was engaged in the process of dyeing leather by trampling on it barefoot in a tub filled with dye. The story goes that she looked up and saw him watching her, so she lifted her skirts a little more than necessary to show off her legs. Robert ordered that she brought through the back door to meet him, but she refused such a humiliating method, and insisted she would have to enter the castle on horseback through the front gate.
The duke was too anxious to have her join him that he agreed, and a few days later, cleaned up and dressed well, she rode on a white horse through the front gate of the castle. His son William was born in 1027 or 1028.
More realistically, she married Herluin de Conteville in 1031, viscount of Conteville (although that title may have come later, granted him by his step-son, William, after William came to the dukedom). With Herluin she had two sons, Robert of Mortain and Odo, the bishop of Bayeux. They also had two daughters, Emma and another, both of whom made good marriages to nobles.
Robert de Torigni claimed that she was buried at the Abbey of Grestain, a Benedictine monastery founded by Herluin. The statue above of her is in Huy, Belgium, which claims to be her country of origin.
Her other son was Odo, who (like Robert of Mortain) was highly valued by their famous half-brother. Odo became a bishop, and may be the person who instigated the creation of the Bayeux tapestry, which is not a tapestry, but we'll explain that tomorrow when we talk about him.