A former Singaporean Cabinet minister was sentenced on Thursday to a year in prison after he pleaded guilty to charges of receiving illegal gifts, in a rare criminal case involving a minister in the Asian financial hub.

Former transport minister S Iswaran had pleaded guilty last week to one count of obstructing justice and four of accepting gifts from people with whom he had official business.

He was the first minister to be charged and imprisoned for nearly half a century.

Justice Vincent Hoong, in his ruling, said holders of high office “must be expected to avoid any perception that they are susceptible to influence by pecuniary benefits”.

“I am of the view that it is appropriate to impose a sentence in excess of both parties’ positions,” Mr Hoong said as he handed down a total of 12 months imprisonment for the five charges.

The defence had asked for no more than eight weeks in prison, while the prosecution had pushed for six to seven months’ imprisonment.

The court approved Iswaran’s request to delay the start of his sentence to Monday, Channel News Asia reported. He remains out on bail for now. It is unclear if he will appeal against the sentence.

Iswaran was initially charged with 35 counts, but prosecutors proceeded with only five, while reducing two counts of corruption to receiving illegal gifts. Prosecutors said they will apply for the remaining 30 charges to be taken into consideration for sentencing. No reasons were given for the move.

Iswaran received gifts worth over 74,000 Singapore dollars (£43,290) from Ong Beng Seng, a Singapore-based Malaysian property tycoon, and businessperson Lum Kok Seng.

The gifts included tickets to Singapore’s Formula 1 race, wine and whisky and a luxury Brompton bike. Mr Ong owns the right to the local F1 race, and Iswaran was chairman of and later adviser to the Grand Prix’s steering committee.

The attorney-general’s chambers said it will decide whether to charge Mr Ong and Mr Lum after the case against Iswaran has been resolved.

Singapore was ranked among the world’s top five least-corrupt nations, according to Transparency International’s corruption perception index.

The last Cabinet minister charged was Wee Toon Boon, who was found guilty in 1975 and jailed for accepting gifts in exchange for helping a businessperson. Another Cabinet minister was investigated for graft in 1986, but died before charges were filed.

Iswaran had resigned just before he was charged. His trial comes just over four months after Singapore installed new Prime Minister Lawrence Wong after Lee Hsien Loong stepped down after 20 years.