Prema vilasa about the disappearance of Srila Sanatana Goswami and how Srila Rupa Goswami was very much affected by his divine disappearance.
Srila Narrotama das Thakura has sung:
kaha mora svarupa-rupa, kaha sanatana
kaha dasa raghunatha patita-pavana (2)
2) Where are my Svarupa Damodara and Rupa Gosvami? Where is Sanatana? Where is Raghunatha Dasa, the savior of the fallen?
apayayan mam anabhipsum andham
kapambudhir yah para-duhkha-duhkhi
sanatanas tam prabhum asrayami
Raghunatha dasa Goswami has glorified Sanatana Goswami in his Vilapa Kusumanjali (6) “I was unwilling to drink the nectar of devotional service possessed of renunciation, but Sanatana Goswami, out of his causeless mercy, made me drink it, even though I was unable to do so. Therefore he is an ocean of mercy. He is very much compassionate to fallen souls like me, and thus it is my duty to offer my respectful obeisances unto his lotus feet and take shelter of him.”
Srila Sanatana Goswami is described in Gaura-Ganodesha-Dipika by Sri Kavi Karnapura
“Rupa Manjari’s closest friend, who was known by the names Rati-Manjari and Lavanga Manjari, appeared in the pastimes of Sri Chaitanya mahaprabhu as Sri Sanatana Goswami, who was considered to be a personal extension of the body of Sri Chaitanya Mahaprabhu.”
Lavanga Manjari is one of the asta manjaris, the main 8 manjaris assisting the asta Sakhis in service to Radha Krsna
In the eastern part of Sri Tungavidya’s kunja lies Lavanga-sukhada Kunja, which is very enchanting to all the beautiful-eyed gopis. In that kunja, Sri Lavanga Manjari always blissfully resides. In age, she is one day older than Sri Rupa Manjari, and she is very famous for her pleasant nature. Her complexion is like lightning, and she wears a dress marked with stars. She gives much happiness to Sri Krsna, and her nature is always daksina-mrdvi. Her age is 13 years 6 months and 1 day. In Kali-yuga, in gaura-lila, she is known as Sri Sanatana Gosvami.
In his Dhyanachandra Arcana Paddhati ,Srila Dhyanachandra Goswami has given a nice meditation on Lavanga Manjari and gayatri mantra to daily remember Lavanga Manjari