It is related, that, in 1337, a lord of Serres erected a castle in the midst of the Pont Long, and in a short time nearly two hundred houses were nestling under the protection of his turrets. All was going on well; the ground began to be drained and cultivated, and everything promised a happy result to the undertaking; but a storm of wrath rose in the mountains, the haughty owners of a useless marsh, unwilling that it should serve a good purpose to others, though of no importance to themselves, roused their followers, and, to the number of several hundreds, rushed from their snowy retreats, and, in one night, ravaged and destroyed all they met with. The new settlers fled in consternation, while the Ossalois burnt and threw down their dwellings, leaving a heap of ruins, which may still be traced in the midst of the Pont Long. They took refuge at some distance, where their dangerous neighbours had no right, and built themselves a village, which is that of Serres-Castel at the present time.

At one period Henry II., the grandfather of Henry IV., was desirous of forming a park for deer, and, taking possession of a track of ground, he surrounded it with walls. The Ossalois consulted together, and discovered that this ground was one of the dependencies on the Pont Long. Without condescending to remonstrance they assembled in bands, and marching down with flags flying, demolished the enclosures and took back their possession.

In the same year, 1543, the sovereign of Béarn was obliged to solicit of these tyrants of the valley permission for his cousin, the Dame d'Artiguelouve, to send her cattle to feed in the Pont Long, to which they consented "for a consideration"—i.e. by being paid the baccade, such as is demanded of the shepherds.

The Princess Magdelaine, governess of Prince François Phoebus, in 1472, obtained, as a favour, the permission for her physician, Thomas Geronne, to introduce seven mares to feed in the marsh. A letter of the princess entreats, also, at another period, the same grace for the cattle of her treasurer-general.

For more than eight centuries the possession of this precious marsh has been the subject of litigation, and it has remained in its barren state.

The Vallée d'Ossau has had to defend its rights sometimes against the viscounts of Béarn, sometimes against the monks of Cluny, and the Poublans of Pau. Law or combats have been always necessary to enable them to retain their rights. It was on occasion of a decision in their favour by Gaston IV., that the Ossalois made a gift to that prince of the sum of two thousand four hundred florins, to aid him in finishing the castle of Pau, which was then in the course of erection.

This Pont Long, which has so long been an apple of discord to Béarn, is at the present hour likely to have settled bounds; for, in 1837, the members of the Cour-Royal of Pau occupied themselves on the subject, and a chance exists of something useful being done with the ground: there is a project for encouraging mulberry-trees and silk-worms there, and of making a canal to carry off its waters, and render it fit for cultivation. This is the more necessary, as fever and ague are sufficiently common in its neighbourhood. But, even within a very few years, when an enlightened agriculturist, M. Laclède, endeavoured to clear the ground, and plant and improve, the fury of opposition he experienced was disgracefully extraordinary. Under the pretext that their pastures were invaded, the people came with fire and hatchet, and burnt his trees, and cut away his bridges and aqueducts.

A spot is shown in the Pont Long, called Henri Quatre's marsh; for it is said that this prince being one day out shooting snipes, got so entangled in the mud that it was with the greatest difficulty he was rescued from his unpleasant predicament.

There is an oasis in this desert, the village of Uzein, which is a standing proof of the possibility of effecting all that industry can desire in this condemned place: the people of this flourishing village owe their success to the determined perseverance of their curate, who exhorted and persuaded his parishioners to bring manure for their fields from Serres, and, at the end of a few years, all was brilliant and smiling, and Uzein is considered to produce the best maize in Béarn.

There are a few towers still standing, where castles have been erected on the Pont Long; an old grey tower of Navailles, and one of Montaner, so strong as to have proved indestructible: it was built by Gaston Phoebus, at the same time as that of Pau, and what remains of the walls of its donjon are upwards of ten feet thick!