But there was a certain Tasgetius, a descendant of the old royal house of the Carnutes. As a reward for his services to the Romans Cæsar restored him to his hereditary throne. The theocracy felt itself attacked; the Druids roused the republican spirit of the people. The doubtful success of Cæsar’s second expedition to Britain seemed to offer a good opportunity for successful revolt. The people rose and assassinated their King, who was also the Roman nominee. Cæsar immediately ordered a legion under Lucius Plancus to advance upon Chartres, punish the conspirators, and take up its winter quarters there. When the railway was being constructed in 1846, it was necessary to remove a vast mound which lay to the west of the town between the Portes des Épars and Porte Chastelet. Many Roman, Gallic and Carlovingian coins[6] were found in it, and it is supposed that this mound represented in part the material dug out when the foundations of the crypt and of the Cathedral were sunk, and in part the remains of the camp of Plancus. The threatening aspect of affairs in Gaul called for prompt action on the part of Cæsar. Before the end of the winter (53 B.C.) he made a dash into the country of the Nervii, and then in the early spring held his usual Council of Gaul, probably at Amiens. The Carnutes, Senones and Treveri, omitted to send their representatives. Cæsar took this as a declaration of war. He immediately broke up the Council and ordered it to meet again at Paris, which was a convenient point for operating against the Senones at Sens, and thereafter against their neighbours the Carnutes at Chartres. The brilliant rapidity of his movements terrified these tribes. Acco, the leader of the conspiracy, summoned his supporters to the towns. But whilst they were endeavouring to obey the summons, news came that the Romans were already in their midst. Through the Ædui and Remi, who acted as mediators, the Carnutes and Senones sent to make submission and beg for pardon. Cæsar granted it for the time, and then devoted his energies to the destruction of Ambiorix, and the chastisement of the Treveri and the tribes on the Rhine.