The boat of the Onam feast (the Thiruvonathoni of Aranmula)
A Brahmin of Kattoor fed a guest every Thiruvonam before his own meal. One year a boy came at last, and that night Krishna told him in a dream to bring the feast to Aranmula instead. When robbers attacked the boat, the riverside villages rowed out to guard it, and their snake boats, the palliyodams, still escort it.
The Bhattathiri of Mangattu Illam at Kattoor, who believed his son was the gift of Parthasarathy of Aranmula, fed a young Brahmin every Thiruvonam before eating. One year none came until, late in the day, a boy appeared and ate. That night Krishna told him in a dream to bring the feast to the Aranmula temple. He carried it by boat each year, the Thiruvonathoni; when bandits attacked it, the villagers rowed out to protect him, and their snake boats, later dedicated to the temple as palliyodams, have escorted it ever since. The family now sets out from Kumaranalloor.
Sources: Thiruvonathoni, Aranmula Parthasarathy Temple (Kerala Tourism); Thiruvonathoni, Aranmula Palliyoda Seva Sangam; Aranmula Vallasadya: history and evolution (Mathrubhumi English); Mangattu Bhattathiri sets sail for Aranmula (The Hindu, 23 August 2026)