Widowed baroness, mother, founder of the Congregation of the Visitation, who died in 1641
Here is CatholicBrain's index of Saints. This is a great resource for learning about the lives of the saints at home or in the classroom!
Saint Jean-Baptiste-Marie Vianney
The Cure of Ars, d. 1869
Saint Jeanne de Valois
St. Jeanne, also known as Jehanne de France or Jane of Valois, queen, founder of the Annonciades. She died in 1505
Saint Jerome Emiliani
Soldier, priest, founder of the Order of Somascha, d. 1537
According to apocryphal literature, the father of Mary
Saint Joan of Arc
St. Joan of Arc is the patroness of soldiers and of France. On January 6, 1412, Joan of Arc was born to pious parents of the French peasant class in the obscure village of Domremy, near the province of Lorraine. At a very early age, she was said to have heard the voices of St. Michael, St. Catherine, and St. Margaret.
Saint John Berchmans
Jesuit, always pious, who died in 1621 at the age of 22.
Saint John Boste
Or John Boast. Priest, martyred at Durham in 1594. One of the Forty Martyrs of England and Wales.
Saint John Capistran
Lawyer, governor, ambassador, became a Franciscan priest and a renowned preacher, died in 1456
Saint John Twenge
Canon regular, prior of St. Mary's, Bridlington. Miracle-worker, d. 1379
Saint John and Paul
Roman martyrs, c. 362
Saint John of God
Portuguese shepherd, soldier, bookseller, finally found his niche caring for the health of the poor in Granada, became de facto founder of a religious order, d. 1550
Saint Josaphat Kuncevyc
Lithuanian-born Basilian monk and Ruthenian Rite archbishop of Polotsk, writer. He loved to make profound bows while reciting the Jesus Prayer. Martyred in 1623
Saint Joseph Calasanctius
Priest, founder of the Piarists, d. 1648.
Saint Joseph of Cupertino
Mystic from a very young age, priest, d. 1663
Martyred in the Diocletian persecution. The oldest notice says that she died near Naples; the notion that she lived in Nicomedia is strictly legendary
Saint Juliana Falconieri
Niece of St. Alexis Falconieri. She founded the Servite Third Order, and died in 1341