अहम् I, महत् great, पितृपैतामहम् inherited from ancestors, राज्यम् kingdom, प्रशासतः while he was ruling, तस्य his, सर्वेषु कालेषु at all times, प्रेष्यवत् like a servant, प्रणतः an obedient one, स्थितः remained.
'I served him obediently like a servant while he ruled over the great ancestral kingdom inherited by him.