ducally

The supporters of the Nevilles Earls of Westmoreland were two bulls argent, ducally collar'd gold, armed or, &c.
English and Scottish Ballads, Volume VII (of 8)|Various
The family crest of Sir Robert Manners was a bull's head erased gu., ducally gorged and chained or.
English Heraldic Book-stamps|Cyril Davenport
Supporters: two lions rampant guardant argent, ducally gorged or.
A Complete Guide to Heraldry|Arthur Charles Fox-Davies
Lozenge: Argent, a chief azure, over all a lion rampant gules, ducally crowned or (St. George).
A Complete Guide to Heraldry|Arthur Charles Fox-Davies

Crest: A woolpack charged with a ram couchant all proper, ducally crowned azure.
A Complete Guide to Heraldry|Arthur Charles Fox-Davies