Matilda gave birth to her third son William on 22 July 1136 at Argentan, and she then operated out of the border region for the next three years, establishing her household knights on estates around the area.
Matilda melahirkan putra ketiganya, William, pada tanggal 22 Juli 1136 di Argentan, dan ia kemudian beroperasi di luar wilayah perbatasan selama tiga tahun berikutnya, membangun rumah tangganya ksatrianya di wilayah sekitar daerah itu.