In 154 BC, the Roman senate objected to the Belli town of Segeda building a circuit of walls, and declared war. At least three tribes of Celtiberians were involved in the war: the Titti, the Belli (towns of Segeda and Nertobriga) and the Averaci (towns of Numantia, Axinum and Ocilis). After some initial Celtiberian victories, the consul Marcus Claudius Marcellus inflicted some defeats and made peace with the Celtiberians. The next consul, Lucius Licinius Lucullus, attacked the Vaccaei, a tribe living in the central Duero valley which was not at war with Rome. He did so without the authorisation of the senate, with the excuse that the Vaccaei had mistreated the Carpetani. The Second Celtiberian War overlapped with the Lusitanian War of 155–150 BC.