Valmiki Ramayana Ayodhya Kanda Sarga 45 Shloka 4

सः that, काकुत्स्थ: descendant of the Kakutsthas (Rama), तदा then, स्वाभिः his own, प्रकृतिभिः by the subjects, याच्यमानः although pleaded, पितरम् father's, सत्यम् as truthful, कुर्वाणः doing, वनमेव to the forest, अन्वपद्यत proceeded.

Although entreated by his subjects (not to go) Rama proceeded to the forest to make his father's vow come true.