Tanistry was a system for passing on titles and lands. In this system the Taniste (Irish Táinste; Scottish Gaelic Tànaisteachd; Manx Tanishtagh) was the office of heir-apparent, or second-in-command, among the (royal) Gaelic patrilineal dynasties of Ireland, Scotland and Man, to succeed to the chieftainship or to the kingship.
In Ireland, it remained fully in force among the main dynasties, as well as lesser lords and cheiftains, until the early 17th century, and lingered, albeit in much reduced form, until as late as the 1840's. It was revived in the 20th century for the purposes of Clan gatherings, especially by fully organised clans with membership deeply aware and appreciative of their history. The Gaelic imported their customs, this included, to those parts of Scotland they came to control.
Contrary to some beliefs, apparently the Pictish, the other foundational ethnicity of today Scotland, did not share the succession principles of their distant celtic relatives of Ireland and Scottins Gaelics. There is basically no female succession or even allowing for through female links in the Irish and Gaelic succession model, i.e ideal form of this tanistry, whereas Pictish succession more than regularly used links through females (maternal grandson apparently was preferred heir to grandfather; and/or maternal nephew to uncle in Pictish custom). Tanist also is a foreign term to the Pictish.
The usual rules for qualification as a roydammna was that a candidate had to be a member of the "Derbfhine", a kindred all descended in the male line from a common ancestor (usually a great grandfather or great-great grandfather). This is recalled in the coats of arms of representatives of the many clans and septs descended from the Uí Néill royal dynasty, many of which feature the Red Hand. The joints in the fingers, the fingernails, and the hand itself, represented the four/five generations that qualified for inclusion within the Derbfhine. This meant that the group itself became highly exclusive, keeping the kingship within the dynasty and not the wider clan, many of whom were reduced to mere gentry or even peasant status (though they might too share the surname). (These features make tanistry as a clearly agnatic succession mode, and a succession by appointment, being obviously an elective monarchy. The basic requirement of the nature of hereditary monarchy, i.e the outcome ofthe succession being predictable up to the identity of successor and next heirs by genealogy, is not fulfilled in tanistry.)
The downside of this large and equal group of eligibles was that proliferation of roydammna in each generation might lead to internecine dynastic civil war. Such was the case among the descendants of King and High King Tairrdelbach mac Ruaidri Ua Conchobair (1088-1156). His dynasty, the Sil Muirdeag (who took the surname hUa Conchobhair/O'Connor), had successfully ruled as Kings of Connacht since at least the mid-5th century. Their increasing consolidation of their position - via the annexation of the Kingdoms of Mide and Dublin, plus suborning neighbouring states and lordships to vassalage - paved the way for Tairrdelbach to become the first of his dynasty to become High King.
However competation between Tairrdelbach's many sons induced corrosive warfare between at least four competing main lines, in addition to allied lordships and kingdoms striving for the main chance. This, coupled with the incursions of the Normans from 1169 onwards (especially the machinations of the de Burgh lords of Clanricarde - fragmented O Conchobhar rule till by the early 1500's they were reduced to ruling a fraction of their former patrimoney.
Another example of Derbfhine or Roydammna proliferation comes from the Annals of Connacht. It states that at the Second Battle of Athenry in August 1316, in addition to King Tadc O Cellaig of Hy-Many, "there fell with him ... twenty-eight men who were entitled to succeed to the kingship of Ui Maine."
A most publicized case was when the Bruce candidate to inherit the crown of Scotland in 1296 pleaded, among other grounds, the traditional tanistry in his favor. He was primogeniturally seen from a cadet branch of the old royal descent, and thus primogeniture would not have favored him, but idea of rotation and balance (and his seniority in physical age and experience) made him a credible competitor. A presumably Pictish ingredient to the situation was that both Balliol and Bruce descended through female lines from the royal house, a relationship not dependable on any Irish principle of succession lines, and were allowed to present candidacy, Bruce also claiming tanistry through a female line. This may be an indication that in Scotland, Pictish and Irish succession rules were intermingled. (Although the judicial resolution of that quarrel, dictated by the feudally-leaning English king, went in favor of the Balliols on basis of primogeniture, the subsequent political events reverted that result to an incidentally more "clannish-tradition" direction, and Robert the Bruce, the grandson of the candidate who pleaded tanistry, ascended the throne despite of the fact of representing a rather junior cadet line of the original Royal House - all future monarchs of Scotland then were succeeding on basis of rights of the Bruce.)
Tanistry as the system of succession left the headship open to the ambitious, and was a frequent source of strife both in families and between the clans, but was conversely quasi-democratic. Tanistry was abolished by a legal decision in the reign of James VI and the English land system substituted.
The rules of succession of the dynasty of Alpin of kings of Scotland, a dynasty legendarily of moxed Pictish and Gaelic origin, and their successors, abided the tanistry rules until at least 1034, were used in certain successions in 1090's, and were pleaded as a part of succession litigation as late as in 1290's. A similar system operated in Wales, where under Welsh law any of the sons or brothers of the king could be chosen as the edling or heir to the kingdom.
Constitutional law | History of Ireland | Inheritance
Tanistry | Tanistry | Tanistry | タニストリー | Tanisteri | Tanistry
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