The Vallumbrosan Order (or Vallombrosians) is a Roman Catholic religious order, technically a Benedictine congregation, which derives its name from the motherhouse, Vallombrosa (Latin Vallis umbrosa, 'shady valley'), situated c. 30 km from Florence on the northwest slope of Monte Secchieta in the Pratomagno chain. They use the abbreviation O.S.B. Vall., the Vall. to distinguish themselves from the Benedictines, who use the abbreviation O.S.B.
The founder, a Florentine named Gualberto Visdomini, was born in the year 985 or 995, and died at Passignano in the year 1073, on 12 July, (his feast day is still celebrated on this day); he was canonized in 1193. Because one of his relatives was murdered, his duty was to avenge the deceased. He met the murderer in a narrow lane and was about to slay him, but when the man threw himself upon the ground with arms outstretched in the form of a cross, John forgave him through the love of Christ. On his way home, he entered the Benedictine Church at San Miniato to pray, and the figure on the crucifix bowed its head to him in recognition of his generosity. This story forms the subject of Burne-Jones's picture The Merciful Knight, and has been adapted by Shorthouse in "John Inglesant".
John Gualbert became a Benedictine monk at San Miniato, but left that monastery to lead a more perfect life. His attraction was for the cenobitic, and not eremitic life, so after staying for some time with the monks at Camaldoli, he settled at Vallombrosa, where he founded his monastery. Mabillon estimates its foundation at a little before 1038. Here, it is said, he and his first companions lived for some years as hermits, but this is rejected by Martène as inconsistent with the reason for leaving Camaldoli. The chronology of the early days of Vallombrosa has been much disputed. The dates given for the founder's conversion varying between 1004 and 1039, and a recent Vallumbrosan writer places his arrival at Vallombrosa as early as 1008. We reach surer ground with the consecration of the church by Rotho, Bishop of Paderborn, in 1038, and the donation by Itta, abbess of the neighbouring monastery of Sant' Ellero, of the site of the new foundation in 1039. The abbess retained the privilege of nominating the superiors, but this right was granted to the monks by pope Victor II, who confirmed the order in 1056. Two centuries later, in the time of Alexander IV, the nunnery was united with Vallombrosa in spite of the protests of the nuns.