ROUND TOWER OF DYSART, NEAR CROOM, LIMERICK.Tighearnmas—His Death—Introduces Colours as a Distinction of Rank—Silver Shields and Chariots first used—Reign of Ugainé Môr—The Treachery of Cobhthach—Romantic Tales—Queen Mab—Dispute which led to the celebrated Cattle Spoil—The Story of the Táin bó Chuailgné—The Romans feared to invade Ireland—Tacitus—Revolt of the Attacotti—Reign of Tuathal—Origin of the Boromean Tribute.CHAPTER VI.