When I put \cite{} within two consecutive footnotes, the second footnote begins with a lowercase letter instead of with a capital.
So the problem is here:
Just like in the third footnote "Ebd." should begin with the capital letter "E"
Here is my MWE:
\documentclass[a4paper,11pt]{scrartcl}
\usepackage[latin1]{inputenc}
\usepackage{csquotes}
\usepackage{blindtext}
\usepackage{filecontents}
\usepackage{hyperref}
\hypersetup{
colorlinks,
citecolor=black,
filecolor=black,
linkcolor=black,
urlcolor=black
}
\usepackage{chngcntr}
\counterwithin*{footnote}{section}
\begin{filecontents}{\jobname.bib}
@book{grillmeier1989,
Address = {Freiburg/{\,}Basel/{\,}Wien},
Author = {Alois Grillmeier},
Call-Number = {TH: Dq1.175 2/3},
Date-Added = {2014-07-24 15:28:40 +0000},
Date-Modified = {2017-12-08 08:50:39 +0000},
Keywords = {secondary},
Publisher = {Herder},
Title = {Jesus der Christus im Glauben der Kirche},
Volume = {2: Die Kirche von Konstantinopel im 6. Jahrhundert},
Year = {1989}}
\end{filecontents}
\usepackage[ngerman]{babel}
\usepackage[style=historische-zeitschrift, maxnames=2, hyperref=true, backref=true, backrefstyle=none, backend=bibtex,idemtracker=true]{biblatex}
\bibliography{\jobname}
%
\begin{document}
\blindtext\footnote{Here comes some text: \cite[See][S. 56]{grillmeier1989}}
\blindtext\footnote{\cite[][S. 56]{grillmeier1989}}
\blindtext\footcite[][S. 56]{grillmeier1989}
\printbibliography
\end{document}


\bibliography{\jobname}instruction is deprecated. Use\addbibresource{\jobname.bib}instead. – Mico Mar 25 '18 at 06:23\footnote{\cite...}, but not when you write\footcite.... Just out of curiosity: Is there a reason for not using\footcite? – Mico Mar 25 '18 at 06:30\footcitewhenever possible. If you for some reason can not use\footcite, but must call\citeat the beginning of a\footnote, you should use\Cite(with a capital "C") instead. https://tex.stackexchange.com/q/171572/35864 and https://tex.stackexchange.com/q/258212/35864 – moewe Mar 25 '18 at 07:01