The collection comprises property in p's Llandderfel, Llandrillo-yn-Edeirnion (including t. Branas), Llanfor, Gwyddelwern, Bettws Gwerfil-Goch, Llanfihangel y Traethau, Llanycil, Llanuwchllyn, Llanymawddwy, Mallwyd (transferred to the Cyfeiliog estate), Llangywer, Trawsfynydd, Llanfrothen and Llanfachreth, all in co. Mer., and in p's Penmachno, Clynnog and Llanbeblig (including properties in Caernarfon), co. Caern. This collection also contains the chief rents for some of the above parishes, including Llanfor, Llanuwchllyn, Llanfachreth, Llangywer, Llanycil, Llandrillo-yn-Edeirnion, Llanfihangel, Llanbeblig and Trawsfynydd; also, a statement of account of almshouses in Llanuwchllyn, R79-R121; election expenses in co. Mont. (1830s); and details of boats (and their owners) on Bala Lake; R83/7e (1828) contains a rental of estates had in exchange from Viscount Clive, consisting of property in p's Llanerfyl, Llangadfan and Llanfair Caereinion, co. Mont. By 1861, some of the above-named places have been gradually omitted from this collection, and only the following parishes in co. Mer. remain: Llandderfel, Llanycil, Llanuwchllyn, Llangywer, Trawsfynydd, Llanfor, Llandrillo and Llanfihangel y Traethau; and from R118/2 to R135/1i chief rents are contained for the following parishes in co. Mer. only: Llanfor, Llanuwchllyn, Trawsfynydd, Llangower, Llanycil, Llandrillo and Llanfihangel y Traethau. Collectors: Griffith Richards, 1809-1821, Samuel Hughes, 1824-1834, Pryce Jones, 1835-1839, John Williams, 1839-1864, John Williams (executor of the first named John Williams), 1865-1866, William Jones, 1867-1871, and Owen Hughes 1871-1879. R122/1b (1867) contains rents only for p's Llanfor, Llanycil, Llanuwchllyn, Llangower and Trawsfynydd, co. Mer., while R122/1h (1867) contains chief rents as specified above; R123/1g (1867) and all succeeding volumes contain the chief rents only, while the other rents of the Glan-llyn estate have been transferred (see R123/1a) to the collection entitled Farm and Cottage Rents. By R135/1i (1879), only the chief rents for the following parishes in co. Mer. remain: Llanfor, Llanuwchllyn, Llangywer, Llanycil and Llandrillo. For details of Glan-llyn chief rents after 1898, see the series of Tithe, Chief and Fee Farm Rentals, which contain Glan-llyn chief rents from 1866 to 1918.