Four Incarnations Due to Four Kumar / Note / Links

Once Attracted by the smell of tulasi on vishnu's neck - the four kumars approach vaikunta  
https://freeglobaluniversity.blogspot.com/search/label/Tulsi

https://freeglobaluniversity.blogspot.com/search/label/VishnuSpousesJesusAllahYogaAtheist

https://freeglobaluniversity.blogspot.com/search/label/Vai

- but are blocked by

1. Jaya 2.Vijay Door Keepers of Vishnu

http://en.wikipedia.org/wiki/Jaya-Vijaya
https://www.youtube.com/results?search_query=Jaya+Vijaya+vishnu 

Due to Curse of Four Kumars 

http://vedabase.net/sb/3/16/en2 

Take Four Incarnations as

1. Hiranyakshipu, Hiranyaksha
2. Ravana, Kumbahkarana
3. Shishupala, Dandavakra
4. Jagai, Magai

https://harekrishnainfo.blogspot.com/search/label/JayaVijaya

To Liberate Them Vishnu Appears as Four Incarnations

1. To liberate Hiranyakshipu - Narasimha
2. To liberate Hiranyaksha - Varaha
3. To liberate Ravana, Kumbahkarana - Rama
4. To liberate  
1. Shishupala, Dandavakra - Krishna 
2. Jagai, Magai - Sri Krishna Chaitanya - Krishna as a Devotee with Radha Bhav 

Sunanda another Gate Keeper cursed for Keeping Quiet

https://harekrishnainfo.blogspot.com/search/label/ShankukarnaPrahladaBahlikaVyasatirthaSukdevRaghavendraKabirVasudevaDatta