A Dictionary of Saintly Women, Volume 2 (https://books.google.com/books?id=rnr_YADaQn4C&pg=PA160&lpg=PA160&dq=saint+plectrude&source=bl&ots=bXF2rw3lnC&sig=DxwIOjVJK2aquv-3PU2tvMm1toY&hl=en&sa=X&ved=0ahUKEwi-mKbUl4nWAhXGRCYKHb1JCvUQ6AEIZDAQ#v=onepage&q=sai