# Use Latin language with babel

I'd like to typeset some parts of the text in Latin language (preferably New Latin, if possible). Latin language is listed among supported languages of Babel. I invoke it as \usepackage[main=british, french, german, latin]{babel} and use in the text like \begin{otherlanguage}{latin}TEXT\end{otherlanguage}, but XeLaTeX keeps telling me Language 'latin' not supported'. This works well for the other languages I use. How can I use Latin language?

As comments suggest, the warning can be produced

\usepackage[
backend=biber,
bibstyle=authoryear,
citestyle=authoryear-comp,
sorting=ynt,
autocite=inline,
maxbibnames=99,
mincitenames=1,
maxcitenames=2,
hyperref=true,
backref=true,
backrefstyle=none,
useprefix=true,
uniquelist=false
]{biblatex}
\DeclareFieldFormat[article]{title}{\mkbibbold{#1}}
\preto\fullcite{\AtNextCite{\defcounter{maxnames}{99}}}


I have some bibliographic entries written in Latin, but the bibliography is typeset in English.

I use texlive 2018.151 on openSUSE Linux. All Latin related packages (well, I have all packages installed) are installed.

• What TeX distribution are you using and on what operating system? – egreg May 27 '18 at 8:47
• Not sure what 2018.151 refers to, because of what's shown on this page. In the “vanilla” TeX Live, support of Latin is in collections-langeuropean. – egreg May 27 '18 at 9:03
• I think this warning can be coming from another package, e. g. biblatex – Michael Fraiman May 27 '18 at 9:06
• @egreg It is version 2018, that 151 is package version (basically technical information). Shortly, it is the newest version with all updates. I have package texlive-collection-langeuropean installed @MichaelFraiman If it is just warning from biblatex and everything works, might be I can just ignore it...? – Tilia May 27 '18 at 9:13
• I'm almost certain this is not a babel warning. Judging by the quotation marks in the message and the wording itself I would bet quite a bit on biblatex. You can ignore the warning if you don't want to write your bibliography in Latin. BTW: This is one of the prime examples why MWEs are so important on this site. With an MWE that guess could be verified in an instant. – moewe May 27 '18 at 10:04

\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[main=british, french, german, latin]{babel}
\usepackage{csquotes}

\usepackage[style=authoryear, backend=biber]{biblatex}

\begin{document}
Lorem
\end{document}


produces the warning

Package biblatex Warning: Language 'latin' not supported.
(biblatex)                Using fallback language 'british' on input line 11.


Your editor may digest that message for you and may only display the 'important' Language 'latin' not supported. bit of that message prominently to you robbing you of the chance to see that it comes from biblatex.

Due to the way language loading works in biblatex, all declared document languages are loaded at the beginning of the document even if they are not used at all. Languages that are not supported yield a warning. Since there is no latin.lbx Latin is not supported by biblatex (if you want to contribute a .lbx file for an unsupported language or know someone who can, drop by at https://github.com/plk/biblatex/issues). If you do not plan to typeset citations or the bibliography in an unsupported language you safely can ignore that message.

• Apparently one TeX.SX wrote their private latin.lbx once, but that was sadly not released to the general public: tex.stackexchange.com/q/110951/35864 – moewe May 27 '18 at 10:42
• Indeed. I use Kile as the XeLaTeX editor and it did not show the second line of warning. – Tilia May 27 '18 at 10:43