Hamsa Sandesham is a fictional work written by Vedanta Desikar. The condition is set after Hanuman's journey to Lanka. It is evident because Lord Rama knew the whereabouts of Sita from Hanuman only. Hanuman was supposed to know the whereabouts whereas this Royal swan is meant for sending message traveling southwards.
Swami Desikar uses the inspiration from Andal, Nammazhwar, Kalidasa to write this Sandesha Kavyam.
Andal, Nammalwar asked bees, birds to take up the message to the Lord. In Kalidasa's Meghaduta, clouds are the messenger. This work is also written in Mandākrāntā meter which is slow advancing having 17 syllables in each pada.
In this work. Lord Rama asks a royal swan to take up his message to his consort goddess Sita. The route and destination is also described. Rama describes the landmarks for the swan. The swan takes it flight through the Tirumala hills, Sri Rangam and Kanchipuram. This kavyam is not only a majestic poetic work but a religious and a philosophical work.
Swami Desikar makes reverence to Lord Ranganatha, the family deity of Ikshvaku dynasty, the same dynasty the hero of the poem belongs to. Then to the Lord Venkateshwara after whom he is named after. The mood in the poem is the same as the mood present in the pasurams written by Tirumangai Azhwar and Nammazhwar on Parakala Nayaki and Parankusha nayaki. Here, Parakala Nayaki and Parankusha Nayaki are not women but azhwars who imagined themselves as women (nayaki) who were yearning themselves for the love of God and feel separated. Here, Lord Rama and Sita are also feeling the separation. There is esoteric philosophical meaning in the poems written in Hamsa Sandesham. He celebrates the glory of the archavatara of Lord Ranganatha.
Hence, this has a greater significance in Sri Vaishnava tradition because Swami Desikar gives out very esoteric message using simple language.
Swami Desikar himself wrote an autobiographical note at the end of the poem while giving out the phalashruti of reading the work Hamsa Sandesham:
vidyāśilpapraguṇamatinā venkataṭeśena kluptaṃ
cintāśāṇollikhitamasakṛtcchreyasāṃ prāpti hetum |
paśyantvantachravaṇamanaghaṃ cakṣurujjīvya santaḥ ||
Meaning: Those who are experts in gemology (examining gems to determine their quality and freedom from blemishes) use the diamond stone to bring out the hidden
lustre of the gems and establish their quality. Those who wear these
blemishless, highest quality gems (Hamsa Sandesha gem) will be blessed with all soubhAgyams. The noble ratnam (gem) has the power to unite the couple, who got separated. Therefore, people buy these well tested, noblest quality gems and enjoy
Venkatesha or Venkata Natha is the name of Vedanta Desikar. This proves that it is written by Himself and hence a fictional work with religious significance.
Oppiliappan Koil Varadachari Sathakopan has written its meaning and commented on it explaining the importance and esoteric meaning from Sri Vaishnava tradition.