diff --git a/data/ontologies/digital-heraldry-ontology-objects.ttl b/data/ontologies/digital-heraldry-ontology-objects.ttl
index dcc47d0f35692eb4d5673bf03f104de4ee583fc5..8ee49f0a54c57ca10fc83378d09d55d7f9e195c8 100644
--- a/data/ontologies/digital-heraldry-ontology-objects.ttl
+++ b/data/ontologies/digital-heraldry-ontology-objects.ttl
@@ -53,6 +53,11 @@ vann:preferredNamespacePrefix rdf:type owl:AnnotationProperty .
 #    Object Properties
 #################################################################
 
+###  http://digitalheraldry.org/digital-heraldry-ontology/objects#datedInCentury
+dhoo:datedInCentury rdf:type owl:ObjectProperty ;
+                    rdfs:subPropertyOf dhoo:hasDate .
+
+
 ###  http://digitalheraldry.org/digital-heraldry-ontology/objects#hasDate
 dhoo:hasDate rdf:type owl:ObjectProperty ;
              rdfs:domain dhoo:Object .
@@ -68,6 +73,14 @@ dhoo:hasLatestDate rdf:type owl:ObjectProperty ;
                    rdfs:subPropertyOf dhoo:hasDate .
 
 
+###  http://digitalheraldry.org/digital-heraldry-ontology/objects#hasLibraryPlace
+dhoo:hasLibraryPlace rdf:type owl:ObjectProperty .
+
+
+###  http://digitalheraldry.org/digital-heraldry-ontology/objects#hasTitle
+dhoo:hasTitle rdf:type owl:ObjectProperty .
+
+
 #################################################################
 #    Classes
 #################################################################