I just found a William Mitchell b. 1797 in Dyke married on 16 June 1822 Margaret Ross who was b. in 1801 and they had 12 childen, I found this on Family Search.
This morning I found on Anc.com a Don'd Ross b. 21 Aug 1804, and bapt. 22 Aug 1804 in Kilmur-Easter, Ross & Chromarty to a John Ross and Christy Monro. FHL #990585