In this case, The Denarius was owned by Ceaser, it was effectively Ceaser's property lent out to the people as a medium of exchange.

Such as The Federal Reserve Notes belong to The Federal Reserve whereas Old U.S. Notes belonged to The United States hence effectively The People.

Possession of property is endowed with a seal, or mark as proof.

While in material affairs it may not be deemed so but in the affairs of Laws, and The Spiritual it is such.