This is not a marriage, but the baptism of the first child of Hans Caspar and Elisabeth Welti - see

for their marriage. But now for his baptism:

MDCCLXXVIII

Adl(iswiler)berg, den 15. [not spelled out - but from context (previous page) it will be December]

H(an)s Casp(ar) Schwarz(en)b(ach) / Elisabeth Wälti

H(an)s Caspar

Lieutenant H(an)s Casp(ar) Nägeli im Sch...(?) / Anna Unholz, Casp(ar) Rellst(abs) nachg(elassese) Wit(we) auf Kilchberg [had married Kilchberg 13.02.1753]

I have added Hans Caspar (the son) to Hans Caspar Schwarzenbach (1758-1828) ooI Elisabeth Welti, ooII Elisabetha Sidler as verified fact (as far as I am concerned, checking the other children is not necessary - anyone interested finds the data on geneanet and could check himself).