mounter

Noun

1. One who mounts.
2. A tool or device used to mount.
3. A person hired to swear to something that is false.
   • […] perjury reaches the most awful height. I have heard of mounters, who attend Westminster Hall and other courts, to swear to any thing that may be required of them, for a trifling fee. - 1816, Means of improving the...