The Gwynedd Archives online catalogue apparently includes a deed referring to Llyn y Meibion but I haven't been able to get the site to open. The same catalogue entry seems to be in a list in a pdf online:
"3666. 1785 1. William Roberts of Llyn y meibion parish of Llandwrog, co. Caernarvon, yeoman. 2. David Thomas, yeoman. DRAFT ASSIGNMENT of Leasehold premises (leased from Sir William Owen of Orielton, co. Pembroke) comprising a house and garden in the parish of Llandwrog, part of Llyn y Meibr, for the remainder of the said term. Rent 18/-"
Bangor University Archives' catalogue includes an early map showing Llyn y Meibion Isaf:
"LLYS/53 Maps of Bodowen (Bodeon) estate in the cos. in Anglesey and Caernarfon, the property of W. Lewis Hughes, Esq.(afterwards Lord Dinorben). Reduced and copied from the original Surveys 1816 by W. Jones. The Caernarvonshire lands were mainly in Upper Llandwrog - Llyn y Meibion Isaf, Ty Nant, Cae Ronwy, Gelli Ffrydan. It is at present a bit of a mystery when these Caernarvonshire properties became part of the Bodeon estate. There are full references to the maps - individual fields, acreage, etc. n.d."
"Llynn y meibion" is also referred to in the NLW will of Hugh John Lewis 1729. And "Glyn y meibion bach" in the NLW will of John Roberts Morris 1841.
And on the Carnarvon Traders website there is an 1886 report from the Carnarvon & Denbigh Herald of 24 September of a body found on the beach between the mouth of the river Llyfni and Clynnog, about three miles from Clynnog and a mile from the mouth of the river, by "Owen Jones, Llyn Meibion." The transcription is a bit long to include here, so this is the link to it, just search "meibion" to find it on the page:
http://www.carnarvontraders.com/news1886.shtmlThis sounds like a different location from the others, assuming someone going with his dog to fetch cows wouldn't have walked all that far. If the body was taken to Clynnog, I wonder whether the place where it was found was in that parish not in Llandwrog. Can't see any likely property names near the coast though.
Drosybont