NAUTICUS is informed that in Norfolk one of the hundreds, or subdivisions of the county, is called _Grimshoo_ or _Grimshow_, after (as it is supposed) a Danish leader of the name of _Grime_ or _Gryme_. He was undoubtedly either _Præsitus Comitatus_ or _Centuriæ Præpositus_ of that part of the country, and gave his name to the hundred as hundred-greeve, which name it still retains. In about the centre of this hundred is a very curious Danish encampment, in a semicircular form, consisting of about twelve acres. In this space are a great number of large deep pits, joined in a regular manner, one near to another, in form of a quincunx, the largest in the centre, where the general's or commander's tent was placed. These pits are so deep and numerous as to be able to conceal a very great army. At the east end of this entrenchment is a large tumulus, pointing towards Thetford, from which it is about five or six miles distant; and which might possibly have served as a watch tower, or place of signal: and here the hundred court used to be called. This place also is known by the name of _The Holes_, or _Grimes-graves_. This part of the country, being open, was a great seat of war between the Saxons and Danes, as appears from many tumuli throughout this hundred, erected over the graves of leaders who fell in battle; or as tokens of victory, to show how far they had led their armies and conquered.--See _Blomfield_ in loco. J. F. F. West Newton. To the various instances already recorded in "N. & Q.," of ancient earthworks having received the name "Grimesdyke," the following may be added. One on Cranbourne Chase, Dorset; three in Berkshire, viz., one near Silchester, one near Oare, where also are Grimsbury, and Grimsbury Forest; another, intersected by the Thames, near Wallingford; another near Witney, Oxfordshire. The great fossa and vallum of Lollius Urbicus in Scotland, is called Graham's and Grime's Dyke. The frequency of its application to various earthworks in such distant parts of the kingdom may perhaps be considered sufficient evidence that the name is not derived from that of any landed proprietor, as suggested by one of your correspondents. I have no doubt the derivation suggested by your first correspondent, NAUTICUS, is the true one, viz., that it is of Saxon origin, signifying Wizard, or the Evil Spirit, which indicates, not only that these earthworks were in existence in Saxon times, but that their origin was even then so remote and mysterious that they were supposed to be the work of supernatural agency. Grimesdyke, described by NAUTICUS as beginning near Berkhamsted, Herts (not Hants, as misprinted in "N. & Q."), and running across the Chiltern hills, is mentioned, _temp._ Henry III., in a charter of Edmund, Earl of Cornwall, granting Ashridge to the fraternity of the Bonhommes: "Usque ad quoddam fossatum quod dicitur Grymesdich."