P569 (date of birth): 1208-01-01 | P570 (date of death): 1248-01-01
| P40 | child | ... | Q2701734 (Siemowit I of Masovia) | Siemowit I of Masovia |
| P373 | Commons category | String | Boleslaus I, Duke of Masovia | ??? |
| P1343 | described by source | ... | Q1485141 (Polish Biographical Dictionary) | Polish Biographical Dictionary |
| P53 | family | ... | Q11340352 (Piasts of Mazovia) | Piasts of Mazovia |
| P22 | father | ... | Q53460 (Konrad I of Masovia) | Konrad I of Masovia |
| P735 | given name | ... | Q19819786 (Bolesław) | Bolesław |
| P735 | given name | ... | Q373257 (Boleslaw) | Boleslaw |
| P31 | instance of | ... | Q5 (human) | human |
| P25 | mother | ... | Q2975930 (Agafia of Rus) | Agafia of Rus |
| P97 | noble title | ... | Q647242 (Duke of Masovia) | Duke of Masovia |
| P106 | occupation | ... | Q116 (monarch) | monarch |
| P106 | occupation | ... | Q1409420 (feudatory) | feudatory |
| P39 | position held | ... | Q647242 (Duke of Masovia) | Duke of Masovia |
| P21 | sex or gender | ... | Q6581097 (male) | male |
| P3373 | sibling | ... | Q936880 (Casimir I of Kuyavia) | Casimir I of Kuyavia |
| P3373 | sibling | ... | Q2701734 (Siemowit I of Masovia) | Siemowit I of Masovia |
| P3373 | sibling | ... | Q5547738 (Judith of Masovia) | Judith of Masovia |
| P26 | spouse | ... | Q19602128 (Gertrud of Wroclaw) | Gertrud of Wroclaw |
| P26 | spouse | ... | Q20065613 (Anastasia of Bielsko) | Anastasia of Bielsko |
| P1871 | CERL Thesaurus ID | cnp02119774 |
| P646 | Freebase ID | /m/09gpl8x |
| P1819 | genealogics.org person ID | I00064857 |
| P227 | GND ID | 1068588977 |
| P7305 | Online PWN Encyclopedia ID | 3879177 |
| P1185 | Rodovid ID | 45887 |
| P7929 | Roglo person ID | p=boleslaw;n=piast;oc=9 |
| P8172 | Sejm-Wielki.pl profile ID | dw.955 |
| P4638 | The Peerage person ID | p11465.htm#i114643 |
| P214 | VIAF cluster ID | 315103344 |
| P4159 | WeRelate person ID | Boleslaus_I_of_Masovia_(1) |
| P2949 | WikiTree person ID | Piast-181 |
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