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From Rodovid EN

Lineage	Hamengku Buwono VI
Sex	Male
Full name (at birth)	Raden Mas Polly Sulistyo [Hb.6.11.1.2.2.1]
Parents ♂ Raden Mas Mangkudimuka [Hb.6.11.1.2.2] [Hamengku Buwono VI]

From grandparents to grandchildren