[OL]Translation assistance

Dear list members,

I am working with information in Clemens Bröring's book, Essener Bauernhöf.
Could someone please help me with the following statements found in it?

Page 364: #11 Holthaus
    Erst um 1660 ist die Stelle mit einer neuen Familie (Wehrfester) besetzt.
Does Wehrfester, in this case, mean "new family" or does it refer to the man
who organized the defense for the bauershaft?

Page 365
    Anna Gesina Hunteborg von außerhalb. What is the translation for
außerhalb?

Page 542
    Eigner auf der Museborg in Uptloh. What was the Museborg?

Page 552 #2 Busse
    What was the Kloster Malgarten?

I will appreciate any help that you can give me. Many thanks.

Carolyn