Caladbolg

thumb|Illustration of Fergus mac Róich carrying [[Sétanta, with sword at his side. (George Denham, 1909)]]

Caladbolg ("hard cleft", also spelled Caladcholg, "hard blade") is the sword of Fergus mac Róich from the Ulster Cycle of Irish mythology.

Fergus calls his sword by that name in Táin Bó Cúailnge. Ailill mac Máta had stolen Fergus's sword when he caught him in flagrante with Medb. Fergus carved a dummy wooden sword to disguise the fact he was unarmed. Ailill returns the sword to him before the final battle, and Fergus speaks a poem over it, calling it Caladcholc in one version, It is said to have been "the sword of Leite from the elf-mounds. When one wished to strike with it, it was as big as a rainbow in the air."

T. F. O'Rahilly argues that Caladbolg is the older form of the name, and interprets it as meaning "hard lightning". He connects it with the Builg, an ancient people of Ireland (he identifies a subgroup of the Múscraige called the Dál Caladbuilg), as well as , the Welsh name of King Arthur's sword Excalibur. Other sources connect similarly named swords with the legends of Arthur, Cú Chulainn, Fergus mac Léti, and Fergus mac Róich.

The name Caladbolg appears in the plural as a generic word for "great swords" in the 10th-century Irish translation of the classical tale The Destruction of Troy, Togail Troí.

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