MUMBAI: The only openly gay prince in India - where same sex relations are illegal - is throwing open his palace doors to lesbians, gays, transgender and other Indians shunned for their sexuality.

Prince Manvendra Singh Gohil, heir apparent to the throne of Rajpipla in western Gujarat state, said it was particularly hard to come out in small-town India, where traditional values hold sway and heterosexual relations are the norm.

"People still face a lot of pressure from their families when they come out, being forced to marry, or thrown out of their homes. They often have nowhere to go, no means to support themselves," he told the Thomson Reuters Foundation.

So the prince, 52, is building a centre for lesbian, gay, bisexual and transgender people (LGBT) on the grounds of his ancestral palace.

"I am not going to have children, so I thought, why not use this space for a good purpose?" Gohil said, adding that he will offer rooms, a medical facility and training in English and vocational skills to help people find jobs.

Gohil came out to his family more than a decade ago, prompting his mother to take out a newspaper advertisement disowning him. Erstwhile royalty in India are still in the spotlight, many holding positions in the government.

After coming out, Gohil set up the Lakshya Trust, a charity for LGBT people in his conservative home state, and became a champion for gay rights. He has made numerous international appearances, including on The Oprah Winfrey Show.

He is a vocal critic of India's colonial-era law that criminalises consensual sexual relations between same sex adults. Earlier this week, the country's top court said it would reconsider its 2013 decision to uphold the law.

"Lifting the law will encourage more people to come out and live their lives freely. But it may also mean more people in need of support," Gohil said.

Gohil said he is renovating and extending his palace, built in 1927, on the 15-acre site, installing solar panels for power, and reserving some land for organic farming.

An online crowdfunding campaign and donations are financing the centre, which will be managed by his charity, he said.

Gohil's high profile has helped the LGBT community in India enormously, said Harish Iyer, a gay rights activist who hosts a radio show dedicated to LGBT issues.

"For him to be one of us, the stakes are even higher, so providing this space is a great gesture," he said.

"We are lucky to have many LGBT-friendly spaces in cities like Mumbai and Delhi. But in smaller towns, there are not so many places, and that is where they are most needed."