(Devaraja or Varadaraja is a form of Lord Vishnu . He has a temple in the Kanchipuram (Vishnu Kanchi) on a hill called The Hasthagiri(Meaning elephant mountain) .There is a story regarding this temple.It seems after completing creation, Lord Brahma wanted to thank Lord Vishnu.When he was not able to it, Lord Vishnu instructed him to go to Kanchipuram and perform an Aswamedha Yaga there, because the effect of performing Yaga there would give thousand fold results. Lord Brahma rushed there and got the alter for the Yaga constructed by Viswakarma and started the Yaga without his consort Goddess Saraswathi, This infuriated the Goddess and she took the form of a river called Vegavathi and started to flow to the Yaga site.Seeing this Lord Vishnu laid down on the way of the flow of the river and prevented the water from Stopping the Yaga, After the Yaga was completed he rose from the sacrificial fire along with his consorts in a Vimana called Punyakoti in the form of Devaraja .As per the request of Lord Brahma he decided to stay in Vishnu Kanchi so that the people of the world would be benefitted.The Goddess of the temple is known as Perum devi.Kanchi became a very great centre of Vaishnavism in later years with Saint Ramanuja, Saint Vedantha Desika and others doing service to God there.
Manavalamamunivar (1370-1443) visited this temple in Kanchi and gave a series of Discourses on Vaishnavism. It was at that time that he wrote this great prayer called DEvaraja Mangalam.Appillai who has written a single verse(Thaniyan)( appreciating Manavala Mamunigal was his disciple.
The Mangalam in Sanskrit letters is available in http://srimannarayana108.blogspot.in/2013/04/during-adiyens-tripto-india-in-2012-i.html )
Prayer addressed to Lord Devaraja
Varadaraja, Devaraja ,
Kanchi vasa Dhaya Pathraa,
Prasamnna Vadana , Ambuja lochana,
Hastha gireesa, Abhaya Hastha,
Perumdevi sameths Sri Devaraja,
Pahi Pahi Prapanna Parijatha
Protect me, protect me , Oh Varadaraja , Oh Devaraja,
Who lives in Kanchipuram. Who is filled with mercy,
Who is the lord of Elephant mountain, who shows symbol of protection by his hand,
Who is Devaraja who is along with Goddess Perumdevi,
And who is like the Parijatha flower to the devotee who has surrendered absoulutely.
Thaniyan praising Manavala Mamunigal
Yaschakre devarajasya mangalasasanam mudhaa ,
THam Vandhe ramya jamathru munim Visadha Vagvaram
I salute the sage who is the pretty son in law* , who is the master of detailed words
Who with happiness wrote this divine prayer on Lord Devaraja.
*Ramya Jamatha was one of the titles of Manavala Mamunigal
Devaraja Mangalam Slokas
1.Mangalam Vedhaso Veda medhini graham medhine ,
Varadaya Dhaya Dhamne Dheerodharaya Mangalam.
1.Auspeciousness to him who rose out of the sacrificial Altar of Lord Brahma and who lives there,
Auspiciousness to Varada, the abode of mercy who is valorous and generous.
2.Vajimedhe vapaahome dathur uthara veditha ,
Udhithaya huthadagne udarangaya Mangalam.
2.Auspeciousness to him who rose from the altar of Aswamedha Yaga of Lord Brahma,
And after rising from the fire showed to his generous body.
3.Yajamanam vidhim Veekshya smayamana mukha sriye ,
Dhayamana druse thasmai Devarajaya Mangalam.
3.Brahma who was conducting the Yagna after seeing his auspicious smiling face ,
Saw you as one who is kindness and so auspiciousness to that Devaraja
4.Varidha shyama vapushe, virajath peetha vasase ,
Varananchala vasaya Varijakshaya Mangalam,
4.Auspeciousness to who has a black body like water rich cloud, who shines in yellow dress,
Who lives on top of Elephant mountain(Hastha giri) and who has lotus like eyes.
5.Adhyapi sarva bhoothaanaam abheeshta phala dhayine ,
Pranatharthi harayasthu prabhave mama mangalam.
5. To the lord who even now fulfills the desires of all beings ,
And who removes the sufferings of those who pray to him, I wish auspiciousness.
6.Divyavayava soundharya divyabharana hethaye ,
Danthavala gireesaya Devarajaya mangalam.
6.Auspeciousness to the Devaraja who is the Lord of elephant mountain(Hasthagiri) ,
Who has divinely pretty limbs decorated by divine ornaments.
7.Purushaya puranaya punya koti nivasine ,
Pushpithodhara kalpadru kamaneeyaya mangalam.
7.Auspeciousness to the the ancient Purusha , who lives in the Punyakoti Vimana ,
Who is pretty like the fully bloomed wish giving tree.
8.Kanchananchala srungagra kala meghanusaarine ,
Suparnaamsavadamsaya surarajaya mangalam.
8.Auspeciousness to the Devaraja who sits like a golden mountain,
On the shoulders of Garuda who looks like a dark black cloud.
(This verse describes the procession in which God DEvaraja rides on his Vahana Garuda)
9.Bhogapavargayorekam vanchadbhyo dadadathe dwayam,
Srimad varada rajaya , mahodharaya mangalam.
9.Auspeciousness to the Varadaraja who has a huge belly(for keeping the world)
And who grants both pleasures as well as final salvation if desired.
10.Mathangajadri thungagra srunga srungagra varshmane ,
Maha Krupayaa madrakshaa deekshithayasthu mangalam.
10.Auspeciousness to him who decorates the highest peak of the elephant mountain,
Who with great kindness has taken the determination to protect me.
11.Sri Kanchi purna misrena preethyaa sarvaabhibashine ,
Atheetharchavyavasthaya Hasththyadreesaya mangalam.
11.Auspecious to the Lord of Hasthagiri who broke his self inflicted penance ,
And talked with great love to Sri Kanchipurna (Thirukachi nambigal)
(This alludes the Lord Telling him the Manthra OM Narayanaya to Thirukachi nambigal)
12.ASthu sri sthana kasthuri vasanaa vaasithorase,
Sri Hastha giri nadhaya Devarajaya mangalam.
12,Auspeciousness to Devaraja who is the lord of Hasthagiri,
Who gives out the fragrance of musk applied to the breasts of Goddess Lakshmi.
13.Mangalasasana parai madacharya purogamai ,
Sarvescha purveracharyai sathkruthayasthu mangalam.
13.Auspeciousness to Lord who has been sung about by my Acharya ,
And all the Acharyas who preceded him , who were engaged in divine works.