Ich bitte um Hilfe bei der Entzifferung einer Sterbeurkunde aus dem Jahr 1699.

Thank you. A general question, which applies to this record (from my lack of knowledge of German language): Sometimes I see the surname written Lang, and sometimes I see it written Langen. Is the "Langen" a grammatical declension meaning "of the person named Lang" or is it a variant of the surname in nominative form? I hope my question makes sense,
 
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