Am 24.05.2014 um 12:51 schrieb Werner Hintze <we.hintze@gmail.com>:

> Thank you. But I still Don’t unterstand. I believe, I can write so:
> 
> \definefontfamily [myfamily] [serif] [Palatino]
> \setupbodyfont[myfamily, 10pt]
> But then I have no italics, bold or small caps.
> 
Which system do you use?

When I use the default palatino font from OS X only the upright style is shown because
there is a bug in the fontloader when the font is in ttc or font format.
> When I write only:
> 
> \setupbodyfont[palatino, 10pt]
> all is well. What’ wromg here?
> 

In this case context uses the tex gyre patella font (a palatino clone), you can load it with
the \definefontfamily command when you write

    \definefontfamily […] […] [TeX Gyre Pagella]

Wolfgang