In an unassuming lake in Ireland’s northern County Longford, an unprecedented find emerged in 1986. Thanks to the sediments in the body of water, pieces of a unique, highly decorated metal object dating to the 9th century were remarkably preserved. And now, after a 39-year conservation project, the nation’s oldest and largest medieval book shrine is now on view.

Known as the Lough Kinale Book Shrine after its namesake lake, the object features a series of medallions with precious stone inserts, along with embellished metalwork in the form of a cross. Part of the exhibition Words on the Wave: Ireland and St. Gallen in Early Medieval Europe at the National Museum of Ireland, Kildare Street, the stunning artifact is complemented by a number of pieces contemporary to its day.

The shrine’s metal is bronze and encompasses an oak container, which would have held a treasured manuscript associated with a Christian saint. Used to convey the volume to various ceremonial activities, it also would have originally featured a leather strap to make it easier to transport.

Words on the Wave also includes a Viking sword uncovered in the River Shannon in Limerick and a beautiful example of a medieval brooch-pin, the Ardshanbally Brooch, which dates to the 8th or 9th century.

Thanks to scientific analysis, manuscripts on loan from the Abbey Library in St. Gall, Switzerland, have also been confirmed to have originated in Ireland. Researchers determined that the vellum pages were made from the hides of Irish cattle, and monks traveled with the books to Switzerland more than a thousand years ago. This exhibition marks the first time in more than a millennium that the illuminated tomes have resided in Ireland.

Words on the Wave continues in Dublin through October 24. Learn more and plan your visit on the museum’s website.