The adpositions of a language may take person marking only when their object is pronominal.  The person marking must distinguish between at least two persons and must be affixal, not clitic.  This property only applies to languages with adpositions (post- and prepositions).  Consider the following Paamese example:

<br><br>a) <i>Mail Ham sÄn lÄ“ta <b>min-nau</b> ranaut VÄ«la.</i> 'Mail Ham 3SG.send letter <b>to.1SG</b> from.place Vila' for "Mail Ham sent me a letter from Vila" 

<br>v) <i>Kai selÅ«s <b>min</b> tÄta ven mane onak.</i> '3SG 3SG.speak <b>to</b> father about money POSS.1SG' for "He spoke to father about my money."

<br><br><b>Reference</b><br>
Bakker, Dik. 2008. Person Marking on Adpositions.
In Haspelmath et al (2008), chapter 48. Available online at <a href="http://wals.info/feature/48">
http://wals.info/feature/48</a href>.