Just outside Grimsthorpe Park is the village of _Swinstead_, in whose church is a large monument to the last Duke of Ancaster, 1809, and an effigy of one of the numerous thirteenth century crusaders. Somehow one never looks on the four crusades of that century as at all up to the mark in interest and importance of the first and third under Godfrey de Bouillon and Cœur de Lion in the eleventh and twelfth centuries; as for the second (St. Bernard’s) that was nothing but a wretched muddle all through. Two miles further on is _Corby_, where the market cross remains, but not the market. The station on the Great Northern main line is about five miles east of Woolsthorpe, Sir Isaac Newton’s birthplace and early home. I think the most remarkable of the Bourne roads is the Roman “Kings Street,” which starts for the north and, after passing on the right the fine cruciform church of _Morton_ and then the graceful spire of _Hacconby_, a name of unmistakable Danish origin, sends first an offshoot to the right to pass through the fens to Heckington, and three or four miles further on another to the left to run on the higher ground to Folkingham, whilst it keeps on its own rigidly straight course to the Roman station on the ford of the river Slea, passing through no villages all the way, and only one other Roman station which guarded a smaller ford at _Threckingham_. [Sidenote: STOW GREEN, ALGAR AND MORCAR] This place is popularly supposed to be named from the three Danish kings who fell in the battle at Stow Green, between Threckingham and Billingborough, in 870; but the fine recumbent figures of Judge Lambert de Treckingham, 1300, and a lady of the same family, and the fact that the Threckingham family lived here in the fourteenth century points to a less romantic origin of the name. The names of the Victors, Earl Algar and Morcar, or Morkere, Lord of Bourne, survive in ‘Algarkirk’ and ‘Morkery Wood’ in South Wytham. _Stow Green_ had one of the earliest chartered fairs in the kingdom. It was held in the open, away from any habitation. Like Tan Hill near Avebury, and St. Anne de Palue in Brittany, and Stonehenge, all originally were probably assembling-places for fire-worship, for tan = fire. But as we go to-day from Bourne to Sleaford, we shall not use the Roman road for more than the first six miles, but take then the off-shoot to the left, and passing _Aslackby_, where, in the twelfth century, as at Temple-Bruer, the Templars had one of their round churches, afterwards given to the Hospitallers, come to the little town of _Folkingham_, which had been granted by the Conqueror to Gilbert de Gaunt or Ghent, Earl of Lincoln.