The flourishing field of the “Global Middle Ages” has facilitated many avenues of scholarship. This includes comparative research that studies devout Muslim and Christian women side by side; many of these women can be defined as mystics and visionaries. There are many famous and named mystics and visionaries in both the Islamic and the Christian traditions, but this entry focuses on lesser-known mystics and visionaries whose lives are recorded in hagiographies (writings on the lives of saints or holy individuals). The texts that are the basis for this entry are Abū ʿAbd ar-Raḥmān al-Sulamī’s (d. 1021) Dhikr an-Niswa al-Mutaʿabbidāt aṣ-Ṣūfiyyāt ( Remembrance of Women Sufi Devotees); Abū al Faraj ibn al-Jawzī’s (d. 1201) Ṣifat as-Ṣafwa ( The Features of the Elect); Jacques de Vitry’s (d. 1240) Vita Mariæ Oigniacensis ( Life of Marie d’Oignies); and Thomas de Cantimpré’s (d. 1272) Vita Lutgardis ( Life of Lutgarde).