Sentence:  In 1826 it was discovered that the log church and the dwellings on the north side of the creek had <WSD>unknownly</WSD> been built on lands set aside by an act of Congress for school purposes, the subsequent rent or sale of which would largely make up the school fund for the Territory. 
Meaning of the word marked with <WSD> tags:  (unknowingly), without knowledge; without intent.