Clan custom is that each successive chief is to drink a full measure of the horn in wine to prove his manhood.
Clan MacLeod custom is that each successive chief, on achieving the age of manhood, should drain, in one draught, the horn which is filled to the brim.
[2] The horn is named after Sir Ruairidh Mòr MacLeòid (c. 1562–1626), the 15th chief of Clan MacLeod.
[3] In 1906, R. C. MacLeod noted that the greater proportion of the horn had been filled in, and that it was "but a moderate drink the present day Chiefs have to quaff.
That night Malcolm encountered a bull which lived in the woods of Glenelg and which had terrorised the local inhabitants.
MacLeod noted another tradition concerning a bull and motto of the clan's chiefs (though not the drinking horn).
[note 1] During his visit, the MacLeod chief learned that one of his clansmen was a convicted criminal who had condemned to be gored to death by a bull.