So, though there was still some store of weapons in the Shire, these were used mostly as trophies, hanging above hearths or on walls, or gathered into the museum at Michel Delving. The Mathom-house it was called; for anything that Hobbits had no immediate use for, but were unwilling to throw away, they called a mathom. Their dwellings were apt to become rather crowded with mathoms, and many of the presents that passed from hand to hand were of that sort.
- The Fellowship of the RIng (Book 1), Prologue
The Mathom-house is a kind of museum in Michel Delving. It stores and displays mathoms, objects that were of value but of no particular use to the Hobbits. One of the mathoms held there included Bilbo Baggins' Mithril-coat until he took it with him to Rivendell in T.A. 3001.