The knop, though richly sculptured, is rarely the pronounced and distinctive feature that it is at Maughold (Figs. 86, 87), St Donat's (Figs. 108, 109), and Sherburn-in-Elmet (Fig. 113), or in the so-called Ravenspurne cross, a monument now standing at Hedon, Yorkshire (Fig. 79). The chamfers of its shaft have traces of figures about midway, and the head is large and imposing, but too ill-defined for the subject to be identified. It has, however, been described as having "curious sculptured emblems of our Lord and the Blessed Virgin Mary." The cross is said to have been erected to commemorate the landing of Henry IV. in 1399 at Ravenspur, near Spurn Head, in the East Riding. Edward IV. also landed there in 1471. Ravenspur was a well-known seaport in former times, but its site is now completely submerged. The cross stood on the seashore at Kilnsea until 1818, when it was removed further inland, for safety from the encroaching sea. It was eventually set up in the town of Hedon. Usually the knop is reduced to a mere bead, or at any rate is nothing more prominent than the expanding cove beneath the actual head, as at Ampney Crucis, Derwen, and in the two crosses at Cricklade. A factor of immense importance in preserving the organic coherence between shaft and head (wherever the latter takes the form of a cross) is that the lines of the shaft below the knop and of the lower limb of the cross above the knop, should be absolutely continuous, as though passing through, but not interrupted by, the knop. This requisite is satisfactorily exemplified by two very fine Lincolnshire specimens, viz., the well proportioned cross at Somersby (Fig. 81), and one, now at Keyingham, Yorkshire (Fig. 80), known, from the name of him who set it up there, as the Owst cross, since the exact place from which it originally came in Lincolnshire has not been recorded. In both these instances, the handsome knop, moulded and embattled, is but a surrounding band or ring, which occasions no sort of break in the composition, nor interferes at all with the even trend of its upward lines. At Somersby the motif of the crenellated knop is admirably followed up in the battlements of the gabled roof over the head of the crucifix. The shaft is octagonal, and the cross stands altogether 15 ft. high. The crown and glory of the cross is the head, and it was upon this that the choicest art of the sculptor was lavished; and it is instructive to trace the development from the rudimentary crudities of the thirteenth to the perfect maturity of the late-fifteenth century. In pulling down an old barn in the village of Rothersthorp, Northamptonshire, in 1869, there was found the head of a cross (Fig. 46), which was placed in the parish church in about 1890. The stone is 2 ft. 9 in. high by 1 ft. 3 in. wide. The crucifix, which is surrounded by a ring, springs from a mass of thirteenth-century foliage, the capital beneath being surrounded with a belt of foliage of similar kind.