in all the calculations then made for the new impost. Another constitutional advance was that which substituted "coroners," knights chosen by the county court, for the king's old factotum the sheriff in the duty of holding the "pleas of the crown," i.e. in making the preliminary investigations into such offences as riot, murder or injury to the king's rights or property. The sheriff's natural impulse was to indict every man from whom money could be got; the new coroners were influenced by other motives than financial rapacity, and so were much more likely to deal equitably with accusations. The towns also profited in no small degree from Richard's absence and impecuniosity. One of the most important charters to London, that which granted the city the right of constituting itself a "commune" and choosing itself a mayor, goes back to October 1191, the troubled month of Longchamp's expulsion from England. It was given by Prince John and the ministers, who were then supporting him against the arrogant chancellor, to secure the adherence of London. Richard on his return seems to have allowed it to stand. Lincoln was also given the right of electing its own magistrates in 1194, and many smaller places owe grants of more or less of municipal privilege to Hubert Walter acting in the name of the absent king. The English nation began to have some conception of a régime of fixed custom, in which its rights depended on some other source than the sovereign's personal caprice. The times, it may be remembered, were not unprosperous. There had been no serious civil war since the baronial rising of 1173. Prince John's turbulence had only affected the neighbourhood of a few royal castles. Despite of the frequent and heavy demands for money for the king's service, wealth seems to have been increasing, and prosperity to have been widespread. Strong and regular governance had on the whole prevailed ever since Henry II. triumphed over baronial anarchy. III. THE STRUGGLE FOR CONSTITUTIONAL LIBERTY (1199-1337) Accession of John.