Muirbretha

[2]: 304–305 [1]: 43, 67–68  These fragments are accompanied by glosses and commentaries, which help us understand the nature of early Irish maritime law.

[1]: 33 The manuscript fragments of the Muirbretha deal with the duty to report shipwrecks (A); the sources of revenue from the king's coastal lands (B); the law of property lost through shipwrecks, including the various percentages of the property's value due to the finder, to the original owner, and to various other parties, depending on the situation (C, D, and E).

[1]: 43  The amount of attention paid to the law of shipwrecks reflects the considerable risk involved in shipping in early Ireland.

She argues it is "remarkably similar" to that found in medieval Cornish, Welsh, and English legal sources.

[1]: 58  Jonathan M. Wooding has utilised the "considerable detail on the possible contents of cargoes" contained in the Muirbretha to study the nature of Continental―Irish commerce in the 6th and 7th centuries.