The church (_Hist. Mon._) standing near the ruined Château, comprises a late 14th century nave and an early 16th century choir. The latter, intended as a burial chapel for the owners of the castle, is the more richly decorated. Its buttresses are surmounted with pinnacles, on one of which is a niche containing a statue of the Virgin. The pointed timber-work vaulting of the nave is among the finest in the _Département_ of the Somme, and is decorated with satirical and chimerical carvings. The pulpit is the one from which, on January 25, 1671, St. Vincent-de-Paul preached the sermon which was the starting-point of his Missions. The wooden seats in the nave are ancient. The white marble font is girt with the historical chain of the de Lannoy family, connected by four shields bearing the arms of Folleville, Lannoy, Broix and Hangest. It stands on a small pedestal of grey stone, ornamented at the corners with four carved acanthus leaves. The arches of the stone vaulting of the choir rest on small brackets carved with various _motifs_. Of the two chapels on either side of the choir, that on the left, known as the Virgin Chapel, was used by the owners of the castle. The right-hand one (St. Vincent-de-Paul), is modern in its fittings and decoration (1868). The choir contains several very famous monuments, the finest being the mausoleum of Raoul de Lannoy and Jeanne de Broix; the white marble sarcophagus is the work of Italian artists (the _de Portas_); the stone niche which shelters the sarcophagus contains delicate French carvings. The whole forms one of the most remarkable works of the Renaissance period. The neighbouring tomb is that of François de Lannoy and Marie de Hangest; some of the carvings greatly resemble those of Cardinal Hémard de Denonville's tomb in the Cathedral of Amiens. An ancient stained-glass window near the tomb of Raoul de Lannoy is dedicated to St. Anthony and St. John-the-Evangelist. Above the door of the sacristy are carved marble medallions. The church used to possess a very ancient pall, now in the Museum at Amiens. [Illustration: FRENCH LINES IN THE QUARRIES AT GRIVESNES.] Grivesnes. _Return to the crossing of the Grivesnes, Folleville and Ailly-sur-Noye roads, and take the road leading to_ GRIVESNES. (_See sketch-map p. 84._) _Before reaching the latter, note the_ cemetery of the French 114th Infantry Regiment, _on the right, and a little further on, on the other side_, a quarry containing shelters. [Illustration: GRIVESNES CHATEAU.]