You'll want to read Neil's book, Early Irish Contract Law which has considerable material on the (non) rescindability of contracts and one of the factors is whether the buyer knew and whether the buyer should have known. I don't have a copy with me so I don't know if it's every concisely stated, or as a maxim, but that is the best bet.
----- Original Message ----
From: Dennis King <[log in to unmask]>
To: [log in to unmask]
Sent: Monday, June 9, 2008 2:33:46 PM
Subject: [OLD-IRISH-L] "caveat emptor"
A question for the legal scholars: is there anything in the laws (a
maxim would be nice!) that puts a responsibility on the buyer to
verify that he's really getting what he's looking to buy?