The finest examples of these brooches are preserved in the museum of the Royal Irish Academy in Dublin, the National Museum of Antiquities of Scotland in Edinburgh, and the British Museum. Among the earliest—which are not, however, prior to the later Anglo-Saxon period, and make their appearance about the ninth century—are those with a plain penannular ring, formed of a solid cylindrical rod of silver, terminating with bulbous knobs furnished with expansions, and often covered with a peculiar prickly ornamentation like thistle-heads. Specimens of this style of brooch have been found in Ireland, Scotland, and in the north of England.
The simplest of the silver penannular brooches with discoidal terminations in the museum at Edinburgh is one from Croy in Inverness-shire. It has ends expanding into circular discs with amber settings. The most elaborate, one of two known as the Cadboll brooches, found at Rogart in Sutherlandshire, has four raised heads of birds, two upon the circumference of each disc, and two upon the ring. The collection in the Royal Irish Academy contains several splendid brooches of a similar type, notably the Kilmainham brooch from Kilmainham, Co. Dublin, the surface of which is ornamented with compartments of thin plates of gold tooled with interlaced patterns.
The terminations of the penannular ring soon become so expanded that they fill up exactly half the ring. Upon these flattened plaques, which have just space enough between them for the pin to pass, a serpent or dragon form is a frequent ornament, as well as the intertwined triple ornament, or triquetra, while the surface is set at intervals with bosses of amber. The most remarkable examples of this type are the University brooch in the collection of Trinity College, Dublin, and the Clarendon brooch found in Co. Kilkenny, and now in the museum of the Royal Irish Academy.
The main characteristic of the Celtic brooch is that it is penannular, that is, its ring has an opening, if not real, at least apparent, between its two ends. For even when the narrow opening left between the enlarged ends is closed by a bar, or is finally closed altogether, the flattened plaques are ornamentally treated as if they were still disunited. Of this class of brooches with continuous rings there have survived two world-famed examples, one from Ireland and the other from Scotland. The first of these, known as the Tara brooch, was found in 1850 on the seashore near Bettystown, Co. Louth, and received the title of "Tara" on account of its beauty, and after the celebrated hill of that name. It is composed of white bronze thickly gilded. The ring and expanded head of the pin are divided into a number of panels ornamented with examples of nearly every technical process, being enriched with enamel-work, niello, and inlaid stones; while the metal is hammered, chased, and engraved, and filigreed with extraordinary delicacy. The enamels, of the cloisonné kind, have been made separately and mounted like gems. Attached to the brooch on one side is a finely plaited chain; a similar chain upon the other side has been lost. The reverse of the brooch is unadorned with settings, but decorated with a divergent spiral ornament known as the Celtic trumpet pattern, executed with very great perfection. The probable date of this extraordinary jewel is the tenth century. It is now the chief treasure of the museum of the Royal Irish Academy, for which it was bought in 1867 for the sum of £200.
PLATE XIV
the tara brooch
(national museum, dublin)
The finest after the Tara brooch, and the most famous of Scottish brooches, is known as the Hunterston brooch. It was found in 1826 on the estate of Mr. Robert Hunter, of West Kilbride, Ayrshire, and is now in the National Museum of Antiquities of Scotland. It is somewhat similar to the Tara brooch, and of the same gilt metal, but rather less ornate, and unprovided with enamels, glass pastes, or chain. Its main ornamentation consists of varieties of interlaced work in fine gold filigree, of singularly beautiful design and of remarkable execution. The back is decorated with the trumpet pattern, and engraved with Runic characters.