The first of these mentions that the lands had been held in trust by Archibald Tweed. I think that, and the way they are divided into parts, suggests he was holding them as executor to someone's will or possible as trustee to a marriage settlement.
Book 538 / Page 412 / Number 358587https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSJW-Y9WT-4?i=541&cat=185720Memorial of a release dated 13th Jan 1797 between Archibald Tweed of Drumane [Dromain], farmer, and Jas [?] Callwell [Caldwell] of Tobergell [Tobergill]. In pursuance of the trust therein mentioned, Archibald Tweed granted to Callwell one 13th part, and one 26th part of the townland of Knocknoun otherwise Drains, containing by estimation 219a, and the quarterland of Drumane containing 120a, and the moiety of Loughduff and the turf bog thereunto belonging. For two royal lives, and the life of Samuel Allen the younger. Witnessed by John Callwell of Droagh, farmer, and William Marsh [Walsh?] of Glenarm, gent. Memorial witnessed by said John Callwell and by Robert Hantonville. 9th Feb 1802. William Walsh knows the deponent.
Book 546 / Page 32 / Number 358588https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSJ4-79WD-N?i=344&cat=185720Memorial of a release dated ?0th Mar 1797 between Archibald Tweed of Drumain, farmer, and John Caldwell of Droagh, farmer. Tweed granted to Caldwell four 13th parts of the townland of Knocknoone otherwise Drains, containing 219a, one moiety of the quarterland of Drumane containing 120a, one moiety of the lands of Loughduff and the turf thereunto belonging. For two royal lives, and Samuel Allen the younger. Deed and memorial witnessed by Archibald Tweed the younger, and Robert Hantinville of Glenarm. 9th Feb 1802. William Walsh knows the deponent.
Book 538 / Page 413 / Number 358589https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSJW-Y9WT-4?i=541&cat=185720Memorial of a release dated 10th Jan 1797 between Archibald Tweed of Drumain, farmer, and Daniel Peden of Ballycraigy, farmer. Tweed granted Peden one 13th part, and one 26th part of the moiety of the townland of Knocknoane otherwise Drains containing 219a, and one moiety of the quarterland of Drumane containing 120a, and one moiety of the lands of Loughduff and the turf thereto belonging, barony of Glenarm. For two royal lives, and Samuel Allen the younger. Witnessed by John Callwell [Caldwell] of Drough [Droagh], and William Walsh of Glenarm, gent. Memorial witnessed by said John Callwell [and Robert] Hantenville of Glenarm, gent. 9th Feb 1802. William Walsh knows the deponent.