In Jainism, Nabhi Raja (also known as Nabhiraja) and Marudevi (sometimes referred to as Palak Mata in certain regional traditions, though "Palak Mata" is not a widely used term in primary Jain scriptures) are significant figures.

Nabhi Raja is regarded as the 14th Kulakara (patriarch) in Jain tradition and the father of Lord Rishabhanatha (Adinath), who is the first Tirthankara of the present age (Avasarpini). He is considered a leader who guided humanity at a time when civilization was developing.

Marudevi is the wife of Nabhi Raja and the mother of Lord Rishabhanatha. She is revered for being the first woman to have the auspicious dreams (sixteen in number, according to Jain texts) that heralded the birth of a Tirthankara. Marudevi is honored as an ideal mother figure in Jain culture.

If you are referring to "Palak Mata," it might be a local or familial name for Marudevi or a regional variation. In mainstream Jain scriptures, "Marudevi" is the recognized name.

Summary:

• Nabhi Raja: Father of the first Tirthankara, Rishabhanatha.
• Marudevi: Mother of Rishabhanatha, revered for her virtues and auspicious dreams.

If you have more specific questions about their stories, significance, or mention in Jain scriptures, please let me know!