The new house quickly attracted gifts from Clovis II, king of Neustria and his wife, the Anglo-Saxon Queen Bathild (later canonised), and this ensured it a certain prestige.

On that occasion, King Robert II of France made two gifts to the house from the treasure collected by the Emperor Charlemagne at Aix-la-Chapelle.

The early abbots seem to have been Irish missionaries and it is a difficult specialist task to piece together reliable details about their names, origins, and activity.

[3] It is said that in the 10th century Saint Forannan, an Irish Bishop-Abbot who had been originally Bishop of Donoughmore, had St Eloquius’ relics taken to Waulsort Abbey in modern Belgium where he had become abbot.

Another early abbot, though apparently only for a time, was Saint Mombulus, also an Irishman, who left the abbey to evangelize in Picardy around Chauny before dying and being buried at Condren.

[6] In 1075 Abbot Arnold brought to the abbey on horseback from Italy important relics of his younger brother Theobald, who had been canonized by Pope Alexander II not long before (1073).

[7] It is from this relic[8] that the neighbouring locality of Saint-Thibault-des-Vignes took its name in 1081, and that there developed and spread in France the cult of the Saint, who been a hermit and a pilgrim and on his deathbed had taken the vows of a Camaldolese monk.

Having returned briefly as a simple monk to Tiron, he was made Abbot of Lagny (1163-1171), which housed the tomb of his father (see below) and probably of other family members.

At that period the King of Prussia, William I, happened to pass through the village and seeing the condition of the church, left a donation of 400 francs for repairs.

In 1950 the church assumed the present name Notre Dame des Ardents-et-Saint Pierre to commemorate Lagny's deliverance from "Saint Anthony's Fire".